diff --git a/src/bloaty.cc b/src/bloaty.cc
index 78147eaa..cf2698fa 100644
--- a/src/bloaty.cc
+++ b/src/bloaty.cc
@@ -338,8 +338,9 @@ class Rollup {
     CreateRows(row, base, options, true);
   }
 
-  void SetFilterRegex(const ReImpl* regex) {
-    filter_regex_ = regex;
+  void SetFilterRegex(const ReImpl* regex_include, const ReImpl* regex_exclude) {
+    filter_regex_include_ = regex_include;
+    filter_regex_exclude_ = regex_exclude;
   }
 
   // Subtract the values in "other" from this.
@@ -379,7 +380,8 @@ class Rollup {
   int64_t filtered_vm_total_ = 0;
   int64_t filtered_file_total_ = 0;
 
-  const ReImpl* filter_regex_ = nullptr;
+  const ReImpl* filter_regex_include_ = nullptr;
+  const ReImpl* filter_regex_exclude_ = nullptr;
 
   // Putting Rollup by value seems to work on some compilers/libs but not
   // others.
@@ -398,20 +400,33 @@ class Rollup {
   // If there are more entries names[i+1, i+2, etc] add them to sub-rollups.
   void AddInternal(const std::vector<std::string>& names, size_t i,
                    uint64_t size, bool is_vmsize) {
-    if (filter_regex_ != nullptr) {
+    if (filter_regex_include_ != nullptr || filter_regex_exclude_ != nullptr) {
       // filter_regex_ is only set in the root rollup, which checks the full
       // label hierarchy for a match to determine whether a region should be
       // considered.
-      bool any_matched = false;
+      bool exclude = false;
+      if (filter_regex_include_ != nullptr) {
+        bool any_matched = false;
+
+        for (const auto& name : names) {
+          if (ReImpl::PartialMatch(name, *filter_regex_include_)) {
+            any_matched = true;
+            break;
+          }
+        }
+        exclude = !any_matched;
+      }
 
-      for (const auto& name : names) {
-        if (ReImpl::PartialMatch(name, *filter_regex_)) {
-          any_matched = true;
-          break;
+      if (!exclude && filter_regex_exclude_ != nullptr) {
+        for (const auto& name : names) {
+          if (ReImpl::PartialMatch(name, *filter_regex_exclude_)) {
+            exclude = true;
+            break;
+          }
         }
       }
 
-      if (!any_matched) {
+      if (exclude) {
         // Ignore this region in the rollup and don't visit sub-rollups.
         if (is_vmsize) {
           CheckedAdd(&filtered_vm_total_, size);
@@ -1789,13 +1804,17 @@ void Bloaty::ScanAndRollupFiles(
   std::vector<std::thread> threads(num_threads);
   ThreadSafeIterIndex index(filenames.size());
 
-  std::unique_ptr<ReImpl> regex = nullptr;
+  std::unique_ptr<ReImpl> regex_include = nullptr;
+  std::unique_ptr<ReImpl> regex_exclude = nullptr;
   if (options_.has_source_filter()) {
-    regex = absl::make_unique<ReImpl>(options_.source_filter());
+    regex_include = absl::make_unique<ReImpl>(options_.source_filter());
+  }
+  if (options_.has_not_source_filter()) {
+    regex_exclude = absl::make_unique<ReImpl>(options_.not_source_filter());
   }
 
   for (int i = 0; i < num_threads; i++) {
-    thread_data[i].rollup.SetFilterRegex(regex.get());
+    thread_data[i].rollup.SetFilterRegex(regex_include.get(), regex_exclude.get());
 
     threads[i] = std::thread([this, &index, &filenames](PerThreadData* data) {
       try {
@@ -1940,6 +1959,8 @@ USAGE: bloaty [OPTION]... FILE... [-- BASE_FILE...]
   --list-sources     Show a list of available sources and exit.
   --source-filter=PATTERN
                      Only show keys with names matching this pattern.
+  --not-source-filter=PATTERN
+                     Exclude keys with names matching this pattern.
 
 Options for debugging Bloaty:
 
@@ -2139,6 +2160,8 @@ bool DoParseOptions(bool skip_unknown, int* argc, char** argv[],
       }
     } else if (args.TryParseOption("--source-filter", &option)) {
       options->set_source_filter(std::string(option));
+    } else if (args.TryParseOption("--not-source-filter", &option)) {
+      options->set_not_source_filter(std::string(option));
     } else if (args.TryParseFlag("-v")) {
       options->set_verbose_level(1);
     } else if (args.TryParseFlag("-vv")) {
@@ -2247,6 +2270,13 @@ void BloatyDoMain(const Options& options, const InputFileFactory& file_factory,
     }
   }
 
+  if (options.has_not_source_filter()) {
+    ReImpl re(options.not_source_filter());
+    if (!re.ok()) {
+      THROW("invalid regex for not_source_filter");
+    }
+  }
+
   verbose_level = options.verbose_level();
 
   if (options.data_source_size() > 0) {
diff --git a/src/bloaty.proto b/src/bloaty.proto
index 59db6416..a2f9e682 100644
--- a/src/bloaty.proto
+++ b/src/bloaty.proto
@@ -72,6 +72,9 @@ message Options {
 
   // Regex with which to filter names in the data sources.
   optional string source_filter = 13;
+
+  // Regex with which to exclude names in the data sources.
+  optional string not_source_filter = 14;
 }
 
 // A custom data source allows users to create their own label space by
diff --git a/tests/bloaty_test_pe.cc b/tests/bloaty_test_pe.cc
index 14a247ff..3d64365b 100644
--- a/tests/bloaty_test_pe.cc
+++ b/tests/bloaty_test_pe.cc
@@ -110,15 +110,21 @@ TEST_P(BloatyOutputTest, CheckOutput) {
 }
 
 static BloatyTestEntry  tests[] = {
+  // Normal tests on MSVC 15 (2017)
   { "MSVCR15DLL", {}, "msvc-15.0-foo-bar.dll", "msvc-15.0-foo-bar.dll.txt" },
   { "MSVCR15DLLSEG", {"-d", "segments"}, "msvc-15.0-foo-bar.dll", "msvc-15.0-foo-bar.dll.seg.txt" },
   { "MSVC15EXE", {}, "msvc-15.0-foo-bar-main-cv.bin", "msvc-15.0-foo-bar-main-cv.bin.txt" },
   { "MSVC15EXESEG", {"-d", "segments"}, "msvc-15.0-foo-bar-main-cv.bin", "msvc-15.0-foo-bar-main-cv.bin.seg.txt" },
 
+  // Normal tests on MSVC 16 (2019)
   { "MSVCR16DLL", {}, "msvc-16.0-foo-bar.dll", "msvc-16.0-foo-bar.dll.txt" },
   { "MSVCR16DLLSEG", {"-d", "segments"}, "msvc-16.0-foo-bar.dll", "msvc-16.0-foo-bar.dll.seg.txt" },
   { "MSVC16EXE", {}, "msvc-16.0-foo-bar-main-cv.bin", "msvc-16.0-foo-bar-main-cv.bin.txt" },
   { "MSVC16EXESEG", {"-d", "segments"}, "msvc-16.0-foo-bar-main-cv.bin", "msvc-16.0-foo-bar-main-cv.bin.seg.txt" },
+
+  // Filter tests
+  { "FILTERINCLUDE", {"--source-filter", "text"}, "msvc-15.0-foo-bar.dll", "filter_include.txt" },
+  { "FILTEREXCLUDE", {"--not-source-filter", "text"}, "msvc-15.0-foo-bar.dll", "filter_exclude.txt" },
 };
 
 INSTANTIATE_TEST_SUITE_P(BloatyTest,
diff --git a/tests/test.h b/tests/test.h
index dc864f0a..91ed5f8c 100644
--- a/tests/test.h
+++ b/tests/test.h
@@ -140,7 +140,7 @@ class BloatyTest : public ::testing::Test {
   void CheckConsistency(const bloaty::Options& options) {
     ASSERT_EQ(options.base_filename_size() > 0, output_->diff_mode());
 
-    if (!output_->diff_mode()) {
+    if (!output_->diff_mode() && !options.has_source_filter() && !options.has_not_source_filter()) {
       size_t total_input_size = 0;
       for (const auto& filename : options.filename()) {
         uint64_t size;
diff --git a/tests/testdata/PE/x64/filter_exclude.txt b/tests/testdata/PE/x64/filter_exclude.txt
new file mode 100644
index 00000000..330df540
--- /dev/null
+++ b/tests/testdata/PE/x64/filter_exclude.txt
@@ -0,0 +1,7 @@
+sections	vmsize	filesize
+.rdata	2520	2560
+.data	1592	512
+[PE Headers]	696	696
+.pdata	408	512
+.reloc	24	512
+[Unmapped]	0	328
diff --git a/tests/testdata/PE/x64/filter_include.txt b/tests/testdata/PE/x64/filter_include.txt
new file mode 100644
index 00000000..8aa3b0fd
--- /dev/null
+++ b/tests/testdata/PE/x64/filter_include.txt
@@ -0,0 +1,2 @@
+sections	vmsize	filesize
+.text	3587	4096
diff --git a/tests/testdata/PE/x86/filter_exclude.txt b/tests/testdata/PE/x86/filter_exclude.txt
new file mode 100644
index 00000000..e2427c43
--- /dev/null
+++ b/tests/testdata/PE/x86/filter_exclude.txt
@@ -0,0 +1,6 @@
+sections	vmsize	filesize
+.rdata	1772	2048
+.data	908	512
+[PE Headers]	656	656
+.reloc	296	512
+[Unmapped]	0	368
diff --git a/tests/testdata/PE/x86/filter_include.txt b/tests/testdata/PE/x86/filter_include.txt
new file mode 100644
index 00000000..8fbc3f26
--- /dev/null
+++ b/tests/testdata/PE/x86/filter_include.txt
@@ -0,0 +1,2 @@
+sections	vmsize	filesize
+.text	3172	3584