diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0131dcbc4a278..e028cf486c0f2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -347,7 +347,7 @@ please remove the `backport-X.Y` tag from the originating pull request for the c
 ### Git Recommendations For Pull Requests
 
  - Avoid working from the `master` branch of your fork, creating a new branch will make it easier if Julia's `master` changes and you need to update your pull request.
- - Try to [squash](http://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html) together small commits that make repeated changes to the same section of code so your pull request is easier to review. A reasonable number of separate well-factored commits is fine, especially for larger changes.
+ - Try to [squash](https://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html) together small commits that make repeated changes to the same section of code so your pull request is easier to review. A reasonable number of separate well-factored commits is fine, especially for larger changes.
  - If any conflicts arise due to changes in Julia's `master`, prefer updating your pull request branch with `git rebase` versus `git merge` or `git pull`, since the latter will introduce merge commits that clutter the git history with noise that makes your changes more difficult to review.
  - Descriptive commit messages are good.
  - Using `git add -p` or `git add -i` can be useful to avoid accidentally committing unrelated changes.
diff --git a/HISTORY.md b/HISTORY.md
index 1d46189c74c51..d9486c361b934 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5291,7 +5291,7 @@ Language tooling improvements
      talk](https://www.youtube.com/watch?v=e6-hcOHO0tc&list=PLP8iPy9hna6SQPwZUDtAM59-wPzCPyD_S&index=5)
      on Gallium shows off various features of the debugger.
 
-   * The [Juno IDE](http://junolab.org) has matured significantly, and now
+   * The [Juno IDE](https://junolab.org) has matured significantly, and now
      also includes support for plotting and debugging.
 
    * [Cxx.jl](https://github.com/Keno/Cxx.jl) provides a convenient FFI for
@@ -5689,7 +5689,7 @@ Library improvements
 
   * Other improvements
 
-    * You can now tab-complete emoji via their [short names](http://www.emoji-cheat-sheet.com/), using `\:name:<tab>` ([#10709]).
+    * You can now tab-complete emoji via their [short names](https://www.emoji-cheat-sheet.com/), using `\:name:<tab>` ([#10709]).
 
     * `gc_enable` subsumes `gc_disable`, and also returns the previous GC state.
 
diff --git a/Make.inc b/Make.inc
index 910fcdc276e3b..9b826ca4a89c8 100644
--- a/Make.inc
+++ b/Make.inc
@@ -571,10 +571,10 @@ CXX_BASE := ccache
 FC_BASE  := ccache
 ifeq ($(USECLANG),1)
 # ccache and Clang don't do well together
-# http://petereisentraut.blogspot.be/2011/05/ccache-and-clang.html
+# https://petereisentraut.blogspot.be/2011/05/ccache-and-clang.html
 CC += -Qunused-arguments
 CXX += -Qunused-arguments
-# http://petereisentraut.blogspot.be/2011/09/ccache-and-clang-part-2.html
+# https://petereisentraut.blogspot.be/2011/09/ccache-and-clang-part-2.html
 export CCACHE_CPP2 := yes
 endif
 else #USECCACHE
diff --git a/Makefile b/Makefile
index 48c540156ea9b..056436af89fe3 100644
--- a/Makefile
+++ b/Makefile
@@ -160,7 +160,7 @@ release-candidate: release testall
 	@echo 8. Replace github release tarball with tarballs created from make light-source-dist and make full-source-dist with USE_BINARYBUILDER=0
 	@echo 9. Check that 'make && make install && make test' succeed with unpacked tarballs even without Internet access.
 	@echo 10. Follow packaging instructions in doc/src/devdocs/build/distributing.md to create binary packages for all platforms
-	@echo 11. Upload to AWS, update https://julialang.org/downloads and http://status.julialang.org/stable links
+	@echo 11. Upload to AWS, update https://julialang.org/downloads and https://status.julialang.org/stable links
 	@echo 12. Update checksums on AWS for tarball and packaged binaries
 	@echo 13. Update versions.json. Wait at least 60 minutes before proceeding to step 14.
 	@echo 14. Push to Juliaup (https://github.com/JuliaLang/juliaup/wiki/Adding-a-Julia-version)
diff --git a/base/compiler/sort.jl b/base/compiler/sort.jl
index 71d2f8a51cd59..6c8571f6198e6 100644
--- a/base/compiler/sort.jl
+++ b/base/compiler/sort.jl
@@ -1,7 +1,7 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
 # reference on sorted binary search:
-#   http://www.tbray.org/ongoing/When/200x/2003/03/22/Binary
+#   https://www.tbray.org/ongoing/When/200x/2003/03/22/Binary
 
 # index of the first value of vector a that is greater than or equal to x;
 # returns lastindex(v)+1 if x is greater than all values in v.
diff --git a/base/fastmath.jl b/base/fastmath.jl
index 44440ebad2050..a34a4ca66e06b 100644
--- a/base/fastmath.jl
+++ b/base/fastmath.jl
@@ -6,7 +6,7 @@
 # strict IEEE semantics.
 
 # This allows the following transformations. For more information see
-# http://llvm.org/docs/LangRef.html#fast-math-flags:
+# https://llvm.org/docs/LangRef.html#fast-math-flags:
 # nnan: No NaNs - Allow optimizations to assume the arguments and
 #       result are not NaN. Such optimizations are required to retain
 #       defined behavior over NaNs, but the value of the result is
@@ -136,7 +136,7 @@ may violate strict IEEE semantics. This allows the fastest possible operation,
 but results are undefined -- be careful when doing this, as it may change numerical
 results.
 
-This sets the [LLVM Fast-Math flags](http://llvm.org/docs/LangRef.html#fast-math-flags),
+This sets the [LLVM Fast-Math flags](https://llvm.org/docs/LangRef.html#fast-math-flags),
 and corresponds to the `-ffast-math` option in clang. See [the notes on performance
 annotations](@ref man-performance-annotations) for more details.
 
@@ -309,7 +309,7 @@ end
         Complex{T}(c, s)
     end
 
-    # See <http://en.cppreference.com/w/cpp/numeric/complex>
+    # See <https://en.cppreference.com/w/cpp/numeric/complex>
     pow_fast(x::T, y::T) where {T<:ComplexTypes} = exp(y*log(x))
     pow_fast(x::T, y::Complex{T}) where {T<:FloatTypes} = exp(y*log(x))
     pow_fast(x::Complex{T}, y::T) where {T<:FloatTypes} = exp(y*log(x))
diff --git a/base/math.jl b/base/math.jl
index ca2f064e49ee7..752a15b7c7777 100644
--- a/base/math.jl
+++ b/base/math.jl
@@ -1294,7 +1294,7 @@ end
 function add22condh(xh::Float64, xl::Float64, yh::Float64, yl::Float64)
     # This algorithm, due to Dekker, computes the sum of two
     # double-double numbers and returns the high double. References:
-    # [1] http://www.digizeitschriften.de/en/dms/img/?PID=GDZPPN001170007
+    # [1] https://www.digizeitschriften.de/en/dms/img/?PID=GDZPPN001170007
     # [2] https://doi.org/10.1007/BF01397083
     r = xh+yh
     s = (abs(xh) > abs(yh)) ? (xh-r+yh+yl+xl) : (yh-r+xh+xl+yl)
diff --git a/base/sort.jl b/base/sort.jl
index 9272846618a0e..eb57da376f4ab 100644
--- a/base/sort.jl
+++ b/base/sort.jl
@@ -172,7 +172,7 @@ partialsort(v::AbstractVector, k::Union{Integer,OrdinalRange}; kws...) =
     partialsort!(copymutable(v), k; kws...)
 
 # reference on sorted binary search:
-#   http://www.tbray.org/ongoing/When/200x/2003/03/22/Binary
+#   https://www.tbray.org/ongoing/When/200x/2003/03/22/Binary
 
 # index of the first value of vector a that is greater than or equivalent to x;
 # returns lastindex(v)+1 if x is greater than all values in v.
diff --git a/base/special/cbrt.jl b/base/special/cbrt.jl
index 9fda5c41fb09e..ce3a3d67e3ba4 100644
--- a/base/special/cbrt.jl
+++ b/base/special/cbrt.jl
@@ -1,6 +1,6 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
-# Float32/Float64 based on C implementations from FDLIBM (http://www.netlib.org/fdlibm/)
+# Float32/Float64 based on C implementations from FDLIBM (https://www.netlib.org/fdlibm/)
 # and FreeBSD:
 #
 ## ====================================================
diff --git a/deps/patches/llvm-libunwind-freebsd-libgcc-api-compat.patch b/deps/patches/llvm-libunwind-freebsd-libgcc-api-compat.patch
index afb4b941d5b92..0e517d8ec7aa8 100644
--- a/deps/patches/llvm-libunwind-freebsd-libgcc-api-compat.patch
+++ b/deps/patches/llvm-libunwind-freebsd-libgcc-api-compat.patch
@@ -16,7 +16,7 @@ single FDE. I suspect this was just an Apple bug, compensated by Apple-
 specific code in LLVM.
 
 See lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp and
-http://lists.llvm.org/pipermail/llvm-dev/2013-April/061737.html
+https://lists.llvm.org/pipermail/llvm-dev/2013-April/061737.html
 for more detail.
 
 This change is based on the LLVM RTDyldMemoryManager.cpp. It should
diff --git a/doc/src/assets/cover.tex b/doc/src/assets/cover.tex
index 67b77e520acd3..b959477913f59 100644
--- a/doc/src/assets/cover.tex
+++ b/doc/src/assets/cover.tex
@@ -15,7 +15,7 @@
 %% ---- reset page geometry for cover page
 \newgeometry{left=2cm,right=2cm,bottom=3cm}
 % ref: memman@v3.7q, P65, "4.1. Styling the titling"
-%   http://mirrors.ctan.org/macros/latex/contrib/memoir/memman.pdf
+%   https://mirrors.ctan.org/macros/latex/contrib/memoir/memman.pdf
 \begin{titlingpage}
     % set background image
     \BgThispage
diff --git a/doc/src/assets/custom.sty b/doc/src/assets/custom.sty
index 03e6ff805cd3f..ebc11f0414945 100644
--- a/doc/src/assets/custom.sty
+++ b/doc/src/assets/custom.sty
@@ -6,7 +6,7 @@
 \usepackage{geometry}
 % "some": use \BgThispage to change background
 % ref: background@v2.1,# 2.1 Options, "pages="
-%   http://mirrors.ctan.org/macros/latex/contrib/background/background.pdf
+%   https://mirrors.ctan.org/macros/latex/contrib/background/background.pdf
 \usepackage[pages=some]{background}
 
 %% Color definitions for Julia
@@ -27,7 +27,7 @@ contents={
 %% Place the background image `title-bg' in the right place via `tikz'.
 % tikz option "remember picture", "overlay"
 % ref: pgfmanual@3.1.9a, #17.13.1 Referencing a Node in a Different Picture\
-%   http://mirrors.ctan.org/graphics/pgf/base/doc/pgfmanual.pdf
+%   https://mirrors.ctan.org/graphics/pgf/base/doc/pgfmanual.pdf
 \begin{tikzpicture}[remember picture,overlay,draw=white]
   \draw [path picture={
     % ref: pgfmanual, 15.6, "Predefined node path picture bounding box"
diff --git a/src/crc32c.c b/src/crc32c.c
index b38f9d6c0e765..1d667b3dbf656 100644
--- a/src/crc32c.c
+++ b/src/crc32c.c
@@ -3,7 +3,7 @@
  * Version 1.1  1 Aug 2013  Mark Adler, updates from Version 1.2 5 June 2021
  *
  * Code retrieved in August 2016 from August 2013 post by Mark Adler on
- *    http://stackoverflow.com/questions/17645167/implementing-sse-4-2s-crc32c-in-software
+ *    https://stackoverflow.com/questions/17645167/implementing-sse-4-2s-crc32c-in-software
  * Modified for use in libjulia:
  *    - exported function renamed to jl_crc32c, DLL exports added.
  *    - removed main() function
diff --git a/src/debuginfo.cpp b/src/debuginfo.cpp
index b2b4743962fc0..47f8422133600 100644
--- a/src/debuginfo.cpp
+++ b/src/debuginfo.cpp
@@ -1364,7 +1364,7 @@ enum DW_EH_PE : uint8_t {
 // Parse the CIE and return the type of encoding used by FDE
 static DW_EH_PE parseCIE(const uint8_t *Addr, const uint8_t *End)
 {
-    // http://www.airs.com/blog/archives/460
+    // https://www.airs.com/blog/archives/460
     // Length (4 bytes)
     uint32_t cie_size = *(const uint32_t*)Addr;
     const uint8_t *cie_addr = Addr + 4;
diff --git a/src/disasm.cpp b/src/disasm.cpp
index 2e0cb22e43a1c..57896dc2ee4d8 100644
--- a/src/disasm.cpp
+++ b/src/disasm.cpp
@@ -16,7 +16,7 @@
 //
 //    University of Illinois at Urbana-Champaign
 //
-//    http://llvm.org
+//    https://llvm.org
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy of
 // this software and associated documentation files (the "Software"), to deal with
diff --git a/src/flisp/compiler.lsp b/src/flisp/compiler.lsp
index fdc516dce3ea8..e5a79e8fee6bb 100644
--- a/src/flisp/compiler.lsp
+++ b/src/flisp/compiler.lsp
@@ -864,7 +864,7 @@
 
 		 (else #f)))))))
 
-; From SRFI 89 by Marc Feeley (http://srfi.schemers.org/srfi-89/srfi-89.html)
+; From SRFI 89 by Marc Feeley (https://srfi.schemers.org/srfi-89/srfi-89.html)
 ; Copyright (C) Marc Feeley 2006. All Rights Reserved.
 ;
 ; "alist" is a list of pairs of the form "(keyword . value)"
diff --git a/src/mach_excServer.c b/src/mach_excServer.c
index 7e99331fa8554..669fd0e2313aa 100644
--- a/src/mach_excServer.c
+++ b/src/mach_excServer.c
@@ -20,7 +20,7 @@
  * terms of an Apple operating system software license agreement.
  *
  * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * https://www.opensource.apple.com/apsl/ and read it before using this file.
  *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
diff --git a/src/signals-mach.c b/src/signals-mach.c
index 87a2eb4758d4a..5063aa3e8e0d2 100644
--- a/src/signals-mach.c
+++ b/src/signals-mach.c
@@ -412,7 +412,7 @@ kern_return_t catch_mach_exception_raise_state_identity(
 static void attach_exception_port(thread_port_t thread, int segv_only)
 {
     kern_return_t ret;
-    // http://www.opensource.apple.com/source/xnu/xnu-2782.1.97/osfmk/man/thread_set_exception_ports.html
+    // https://www.opensource.apple.com/source/xnu/xnu-2782.1.97/osfmk/man/thread_set_exception_ports.html
     exception_mask_t mask = EXC_MASK_BAD_ACCESS;
     if (!segv_only)
         mask |= EXC_MASK_ARITHMETIC;
diff --git a/src/support/platform.h b/src/support/platform.h
index 56f8cafbc89fa..9ab28ac1c70c3 100644
--- a/src/support/platform.h
+++ b/src/support/platform.h
@@ -8,7 +8,7 @@
  * based of compiler-specific pre-defined macros. It is based on the
  * information that can be found at the following address:
  *
- *     http://sourceforge.net/p/predef/wiki/Home/
+ *     https://sourceforge.net/p/predef/wiki/Home/
  *
  * Possible values include:
  *      Compiler:
diff --git a/src/support/strptime.c b/src/support/strptime.c
index ab75ee05ee8db..27c86c9e4f2b8 100644
--- a/src/support/strptime.c
+++ b/src/support/strptime.c
@@ -134,7 +134,7 @@ static const char * const nadt[5] = {
 
 /*
  * Table to determine the ordinal date for the start of a month.
- * Ref: http://en.wikipedia.org/wiki/ISO_week_date
+ * Ref: https://en.wikipedia.org/wiki/ISO_week_date
  */
 static const int start_of_month[2][13] = {
 	/* non-leap year */
@@ -147,7 +147,7 @@ static const int start_of_month[2][13] = {
  * Calculate the week day of the first day of a year. Valid for
  * the Gregorian calendar, which began Sept 14, 1752 in the UK
  * and its colonies. Ref:
- * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
+ * https://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
  */
 
 static int
diff --git a/stdlib/Dates/docs/src/index.md b/stdlib/Dates/docs/src/index.md
index db452b1912a27..35ec6771efc55 100644
--- a/stdlib/Dates/docs/src/index.md
+++ b/stdlib/Dates/docs/src/index.md
@@ -18,7 +18,7 @@ represents a continuously increasing machine timeline based on the UT second [^1
 [`DateTime`](@ref) type is not aware of time zones (*naive*, in Python parlance),
 analogous to a *LocalDateTime* in Java 8. Additional time zone functionality
 can be added through the [TimeZones.jl package](https://github.com/JuliaTime/TimeZones.jl/), which
-compiles the [IANA time zone database](http://www.iana.org/time-zones). Both [`Date`](@ref) and
+compiles the [IANA time zone database](https://www.iana.org/time-zones). Both [`Date`](@ref) and
 [`DateTime`](@ref) are based on the [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) standard, which follows the proleptic Gregorian calendar.
 One note is that the ISO 8601 standard is particular about BC/BCE dates. In general, the last
 day of the BC/BCE era, 1-12-31 BC/BCE, was followed by 1-1-1 AD/CE, thus no year zero exists.
diff --git a/stdlib/Dates/test/accessors.jl b/stdlib/Dates/test/accessors.jl
index b690a81d70e49..240de42eaa1dc 100644
--- a/stdlib/Dates/test/accessors.jl
+++ b/stdlib/Dates/test/accessors.jl
@@ -153,7 +153,7 @@ end
     @test Dates.week(Dates.Date(2010, 1, 1)) == 53
     @test Dates.week(Dates.Date(2010, 1, 2)) == 53
     @test Dates.week(Dates.Date(2010, 1, 2)) == 53
-    # Tests from http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=1999
+    # Tests from https://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=1999
     dt = Dates.DateTime(1999, 12, 27)
     dt1 = Dates.Date(1999, 12, 27)
     check = (52, 52, 52, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2)
@@ -163,7 +163,7 @@ end
         dt = dt + Dates.Day(1)
         dt1 = dt1 + Dates.Day(1)
     end
-    # Tests from http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2000
+    # Tests from https://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2000
     dt = Dates.DateTime(2000, 12, 25)
     dt1 = Dates.Date(2000, 12, 25)
     for i = 1:21
@@ -172,7 +172,7 @@ end
         dt = dt + Dates.Day(1)
         dt1 = dt1 + Dates.Day(1)
     end
-    # Test from http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2030
+    # Test from https://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2030
     dt = Dates.DateTime(2030, 12, 23)
     dt1 = Dates.Date(2030, 12, 23)
     for i = 1:21
@@ -181,7 +181,7 @@ end
         dt = dt + Dates.Day(1)
         dt1 = dt1 + Dates.Day(1)
     end
-    # Tests from http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2004
+    # Tests from https://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2004
     dt = Dates.DateTime(2004, 12, 20)
     dt1 = Dates.Date(2004, 12, 20)
     check = (52, 52, 52, 52, 52, 52, 52, 53, 53, 53, 53, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1)
diff --git a/stdlib/Dates/test/io.jl b/stdlib/Dates/test/io.jl
index 2c99ac45d0c58..092a58d5d70d1 100644
--- a/stdlib/Dates/test/io.jl
+++ b/stdlib/Dates/test/io.jl
@@ -47,7 +47,7 @@ end
 end
 
 @testset "DateTime parsing" begin
-    # Useful reference for different locales: http://library.princeton.edu/departments/tsd/katmandu/reference/months.html
+    # Useful reference for different locales: https://library.princeton.edu/departments/tsd/katmandu/reference/months.html
 
     # Allow parsing of strings which are not representable as a TimeType
     str = "02/15/1996 25:00"
diff --git a/stdlib/LinearAlgebra/docs/src/index.md b/stdlib/LinearAlgebra/docs/src/index.md
index d263dfe299206..177eec936a7db 100644
--- a/stdlib/LinearAlgebra/docs/src/index.md
+++ b/stdlib/LinearAlgebra/docs/src/index.md
@@ -157,7 +157,7 @@ sorts of systems of linear equations.
 
 ## Special matrices
 
-[Matrices with special symmetries and structures](http://www2.imm.dtu.dk/pubdb/views/publication_details.php?id=3274)
+[Matrices with special symmetries and structures](https://www2.imm.dtu.dk/pubdb/views/publication_details.php?id=3274)
 arise often in linear algebra and are frequently associated with various matrix factorizations.
 Julia features a rich collection of special matrix types, which allow for fast computation with
 specialized routines that are specially developed for particular matrix types.
@@ -300,7 +300,7 @@ of the Linear Algebra documentation.
 | `QRCompactWY`      | Compact WY form of the QR factorization                                                                        |
 | `QRPivoted`        | Pivoted [QR factorization](https://en.wikipedia.org/wiki/QR_decomposition)                                     |
 | `LQ`               | [QR factorization](https://en.wikipedia.org/wiki/QR_decomposition) of `transpose(A)`                           |
-| `Hessenberg`       | [Hessenberg decomposition](http://mathworld.wolfram.com/HessenbergDecomposition.html)                          |
+| `Hessenberg`       | [Hessenberg decomposition](https://mathworld.wolfram.com/HessenbergDecomposition.html)                          |
 | `Eigen`            | [Spectral decomposition](https://en.wikipedia.org/wiki/Eigendecomposition_of_a_matrix)                         |
 | `GeneralizedEigen` | [Generalized spectral decomposition](https://en.wikipedia.org/wiki/Eigendecomposition_of_a_matrix#Generalized_eigenvalue_problem)                            |
 | `SVD`              | [Singular value decomposition](https://en.wikipedia.org/wiki/Singular_value_decomposition)                     |
@@ -402,7 +402,7 @@ up front and cache it for future reuse.
 
 ## Standard functions
 
-Linear algebra functions in Julia are largely implemented by calling functions from [LAPACK](http://www.netlib.org/lapack/).
+Linear algebra functions in Julia are largely implemented by calling functions from [LAPACK](https://www.netlib.org/lapack/).
 Sparse matrix factorizations call functions from [SuiteSparse](http://suitesparse.com).
 Other sparse solvers are available as Julia packages.
 
@@ -586,8 +586,8 @@ LinearAlgebra.rdiv!
 ## BLAS functions
 
 In Julia (as in much of scientific computation), dense linear-algebra operations are based on
-the [LAPACK library](http://www.netlib.org/lapack/), which in turn is built on top of basic linear-algebra
-building-blocks known as the [BLAS](http://www.netlib.org/blas/). There are highly optimized
+the [LAPACK library](https://www.netlib.org/lapack/), which in turn is built on top of basic linear-algebra
+building-blocks known as the [BLAS](https://www.netlib.org/blas/). There are highly optimized
 implementations of BLAS available for every computer architecture, and sometimes in high-performance
 linear algebra routines it is useful to call the BLAS functions directly.
 
diff --git a/stdlib/LinearAlgebra/src/bitarray.jl b/stdlib/LinearAlgebra/src/bitarray.jl
index d1857c3c38659..ccc9138d227a3 100644
--- a/stdlib/LinearAlgebra/src/bitarray.jl
+++ b/stdlib/LinearAlgebra/src/bitarray.jl
@@ -186,7 +186,7 @@ function istril(A::BitMatrix)
 end
 
 # fast 8x8 bit transpose from Henry S. Warrens's "Hacker's Delight"
-# http://www.hackersdelight.org/hdcodetxt/transpose8.c.txt
+# https://www.hackersdelight.org/hdcodetxt/transpose8.c.txt
 function transpose8x8(x::UInt64)
     y = x
     t = xor(y, y >>> 7) & 0x00aa00aa00aa00aa
diff --git a/stdlib/LinearAlgebra/src/blas.jl b/stdlib/LinearAlgebra/src/blas.jl
index 6cc0edfd9f3a1..5d8821cd6e009 100644
--- a/stdlib/LinearAlgebra/src/blas.jl
+++ b/stdlib/LinearAlgebra/src/blas.jl
@@ -10,7 +10,7 @@ using Base: require_one_based_indexing, USE_BLAS64
 
 export
 # Note: `xFUNC_NAME` is a placeholder for not exported BLAS functions
-#   ref: http://www.netlib.org/blas/blasqr.pdf
+#   ref: https://www.netlib.org/blas/blasqr.pdf
 # Level 1
     # xROTG
     # xROTMG
@@ -1065,7 +1065,7 @@ sbmv(uplo, k, A, x)
 Update vector `y` as `alpha*A*x + beta*y` where `A` is a symmetric band matrix of order
 `size(A,2)` with `k` super-diagonals stored in the argument `A`. The storage layout for `A`
 is described the reference BLAS module, level-2 BLAS at
-<http://www.netlib.org/lapack/explore-html/>.
+<https://www.netlib.org/lapack/explore-html/>.
 Only the [`uplo`](@ref stdlib-blas-uplo) triangle of `A` is used.
 
 Return the updated `y`.
diff --git a/stdlib/LinearAlgebra/src/bunchkaufman.jl b/stdlib/LinearAlgebra/src/bunchkaufman.jl
index 19f82167495f3..8d1ded9bf8111 100644
--- a/stdlib/LinearAlgebra/src/bunchkaufman.jl
+++ b/stdlib/LinearAlgebra/src/bunchkaufman.jl
@@ -150,7 +150,7 @@ The following functions are available for `BunchKaufman` objects:
 [`size`](@ref), `\\`, [`inv`](@ref), [`issymmetric`](@ref),
 [`ishermitian`](@ref), [`getindex`](@ref).
 
-[^Bunch1977]: J R Bunch and L Kaufman, Some stable methods for calculating inertia and solving symmetric linear systems, Mathematics of Computation 31:137 (1977), 163-179. [url](http://www.ams.org/journals/mcom/1977-31-137/S0025-5718-1977-0428694-0/).
+[^Bunch1977]: J R Bunch and L Kaufman, Some stable methods for calculating inertia and solving symmetric linear systems, Mathematics of Computation 31:137 (1977), 163-179. [url](https://www.ams.org/journals/mcom/1977-31-137/S0025-5718-1977-0428694-0/).
 
 # Examples
 ```jldoctest
@@ -429,7 +429,7 @@ end
 
 ## reconstruct the original matrix
 ## TODO: understand the procedure described at
-## http://www.nag.com/numeric/FL/nagdoc_fl22/pdf/F07/f07mdf.pdf
+## https://www.nag.com/numeric/FL/nagdoc_fl22/pdf/F07/f07mdf.pdf
 
 
 ##--------------------------------------------------------------------------
diff --git a/stdlib/LinearAlgebra/src/svd.jl b/stdlib/LinearAlgebra/src/svd.jl
index c1b886f616f02..dc8d717932be3 100644
--- a/stdlib/LinearAlgebra/src/svd.jl
+++ b/stdlib/LinearAlgebra/src/svd.jl
@@ -302,8 +302,8 @@ Iterating the decomposition produces the components `U`, `V`, `Q`, `D1`, `D2`, a
 
 The entries of `F.D1` and `F.D2` are related, as explained in the LAPACK
 documentation for the
-[generalized SVD](http://www.netlib.org/lapack/lug/node36.html) and the
-[xGGSVD3](http://www.netlib.org/lapack/explore-html/d6/db3/dggsvd3_8f.html)
+[generalized SVD](https://www.netlib.org/lapack/lug/node36.html) and the
+[xGGSVD3](https://www.netlib.org/lapack/explore-html/d6/db3/dggsvd3_8f.html)
 routine which is called underneath (in LAPACK 3.6.0 and newer).
 
 # Examples
diff --git a/stdlib/Markdown/docs/src/index.md b/stdlib/Markdown/docs/src/index.md
index 44f2f2dbfd688..30f530d1c6263 100644
--- a/stdlib/Markdown/docs/src/index.md
+++ b/stdlib/Markdown/docs/src/index.md
@@ -75,7 +75,7 @@ the text enclosed in square brackets, `[ ]`, is the name of the link and the tex
 parentheses, `( )`, is the URL.
 
 ```
-A paragraph containing a link to [Julia](http://www.julialang.org).
+A paragraph containing a link to [Julia](https://www.julialang.org).
 ```
 
 It's also possible to add cross-references to other documented functions/methods/variables within
diff --git a/stdlib/REPL/src/latex_symbols.jl b/stdlib/REPL/src/latex_symbols.jl
index bc406e1468710..00be62dbb170a 100644
--- a/stdlib/REPL/src/latex_symbols.jl
+++ b/stdlib/REPL/src/latex_symbols.jl
@@ -4,7 +4,7 @@
 # This is used for tab substitution in the REPL.
 
 # The initial symbol listing was generated from the W3C symbol mapping file:
-#         http://www.w3.org/Math/characters/unicode.xml
+#         https://www.w3.org/Math/characters/unicode.xml
 # by the following Julia script:
 #=
 import REPL
diff --git a/stdlib/Random/src/Xoshiro.jl b/stdlib/Random/src/Xoshiro.jl
index b16668e99584b..5569d6d5c1da5 100644
--- a/stdlib/Random/src/Xoshiro.jl
+++ b/stdlib/Random/src/Xoshiro.jl
@@ -10,7 +10,7 @@
 Xoshiro256++ is a fast pseudorandom number generator described by David Blackman and
 Sebastiano Vigna in "Scrambled Linear Pseudorandom Number Generators",
 ACM Trans. Math. Softw., 2021. Reference implementation is available
-at http://prng.di.unimi.it
+at https://prng.di.unimi.it
 
 Apart from the high speed, Xoshiro has a small memory footprint, making it suitable for
 applications where many different random states need to be held for long time.
diff --git a/stdlib/Random/src/generation.jl b/stdlib/Random/src/generation.jl
index 99017c8c76a82..23d53799a40ee 100644
--- a/stdlib/Random/src/generation.jl
+++ b/stdlib/Random/src/generation.jl
@@ -294,7 +294,7 @@ rem_knuth(a::T, b::T) where {T<:Unsigned} = b != 0 ? a % b : a
 # maximum multiple of k <= sup decremented by one,
 # that is 0xFFFF...FFFF if k = (typemax(T) - typemin(T)) + 1 and sup == typemax(T) - 1
 # with intentional underflow
-# see http://stackoverflow.com/questions/29182036/integer-arithmetic-add-1-to-uint-max-and-divide-by-n-without-overflow
+# see https://stackoverflow.com/questions/29182036/integer-arithmetic-add-1-to-uint-max-and-divide-by-n-without-overflow
 
 # sup == 0 means typemax(T) + 1
 maxmultiple(k::T, sup::T=zero(T)) where {T<:Unsigned} =
diff --git a/stdlib/Random/src/normal.jl b/stdlib/Random/src/normal.jl
index 9f663495c1c20..267d9db48fee8 100644
--- a/stdlib/Random/src/normal.jl
+++ b/stdlib/Random/src/normal.jl
@@ -3,7 +3,7 @@
 # Normally distributed random numbers using Ziggurat algorithm
 
 # The Ziggurat Method for generating random variables - Marsaglia and Tsang
-# Paper and reference code: http://www.jstatsoft.org/v05/i08/
+# Paper and reference code: https://www.jstatsoft.org/v05/i08/
 
 # randmtzig (covers also exponential variates)
 
diff --git a/stdlib/Sockets/src/IPAddr.jl b/stdlib/Sockets/src/IPAddr.jl
index 5b480ef30f20e..d3834a8b8bf73 100644
--- a/stdlib/Sockets/src/IPAddr.jl
+++ b/stdlib/Sockets/src/IPAddr.jl
@@ -140,7 +140,7 @@ end
 
 show(io::IO, ip::IPv6) = print(io,"ip\"",ip,"\"")
 # RFC 5952 compliant show function
-# http://tools.ietf.org/html/rfc5952
+# https://tools.ietf.org/html/rfc5952
 function print(io::IO,ip::IPv6)
     i = 8
     m = 0
diff --git a/stdlib/Unicode/test/runtests.jl b/stdlib/Unicode/test/runtests.jl
index 5248bd1e1fd27..2ee7b88ae966b 100644
--- a/stdlib/Unicode/test/runtests.jl
+++ b/stdlib/Unicode/test/runtests.jl
@@ -37,7 +37,7 @@ end
 
 @testset "unicode sa#15" begin
     #Tests from Unicode SA#15, "Unicode normalization forms"
-    #http://www.unicode.org/reports/tr15/
+    #https://www.unicode.org/reports/tr15/
 
     @testset "canonical equivalence" begin
         let ==(a::Array{Char},b::Array{Char}) = normalize(string(a...), :NFC)==normalize(string(b...), :NFC)
diff --git a/test/euler.jl b/test/euler.jl
index 9af79a44cc0d3..c8d0e9a734fd2 100644
--- a/test/euler.jl
+++ b/test/euler.jl
@@ -2,7 +2,7 @@
 
 ## Project Euler
 #
-#  problems: http://projecteuler.net/problems
+#  problems: https://projecteuler.net/problems
 #  solutions: https://code.google.com/p/projecteuler-solutions/wiki/ProjectEulerSolutions
 
 #1: 233168
diff --git a/test/file.jl b/test/file.jl
index 808fba52f9048..2dfd881b8a487 100644
--- a/test/file.jl
+++ b/test/file.jl
@@ -355,7 +355,7 @@ chmod(file, filemode(file) | 0o222)
 @test filesize(file) == 0
 
 # issue #26685
-@test !isfile("http://google.com")
+@test !isfile("https://google.com")
 
 if Sys.iswindows()
     permissions = 0o444
diff --git a/test/mod2pi.jl b/test/mod2pi.jl
index 5b0cb906bcef2..0eeac6f1e3ce4 100644
--- a/test/mod2pi.jl
+++ b/test/mod2pi.jl
@@ -26,7 +26,7 @@
 # 3.14159265359, -3.14159265359
 # pi/16*k +/- 0.00001 for k in [-20:20] # to cover all quadrants
 # numerators of continuous fraction approximations to pi
-#   see http://oeis.org/A002485
+#   see https://oeis.org/A002485
 #   (reason: for max cancellation, we want x = k*pi + eps for small eps, so x/k ≈ pi)
 
 testCases = [