diff --git a/README.md b/README.md
index 6b34840..42f389d 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ jobs:
 | ---- | ---- | ----------- |
 | [rust-cache] | Action | Caches dependencies, install artifacts, and build artifacts in Rust projects. |
 | [rust-set-rust-version] | Workflow | Updates the rust-version in Rust crates to the latest stable version. |
+| [rust-check-git-rev-deps] | Workflow | Check that git rev dependencies do not reference revisions likely to be orphaned. |
 
 #### Releasing / Publishing
 
diff --git a/rust-check-git-rev-deps/README.md b/rust-check-git-rev-deps/README.md
new file mode 100644
index 0000000..c481d61
--- /dev/null
+++ b/rust-check-git-rev-deps/README.md
@@ -0,0 +1,18 @@
+# rust-check-git-rev-deps Action
+
+The rust-check-git-rev-deps action checks that `git` dependencies that are
+versioned by a commit sha are not referring to a commit that is likely to become
+orphaned.
+
+Commits are accepted by the check if they can be found in one of:
+- The history of the default branch of the repository.
+- The history of a tag of the repository.
+
+## Usage
+
+```yml
+jobs:
+  my_job:
+    steps:
+    - uses: stellar/actions/rust-check-git-rev-deps@main
+```
diff --git a/rust-check-git-rev-deps/action.yml b/rust-check-git-rev-deps/action.yml
new file mode 100644
index 0000000..70bdbee
--- /dev/null
+++ b/rust-check-git-rev-deps/action.yml
@@ -0,0 +1,7 @@
+name: 'Rust Check Git Rev Deps'
+description: 'Check that git revision dependencies are unlikely to be orphaned'
+runs:
+  using: "composite"
+  steps:
+  - shell: bash
+    run: ${{ github.action_path }}/check.sh
diff --git a/rust-check-git-rev-deps/check.sh b/rust-check-git-rev-deps/check.sh
new file mode 100755
index 0000000..8d90b24
--- /dev/null
+++ b/rust-check-git-rev-deps/check.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o pipefail
+set -o nounset
+
+# Get repo and sha's of all dependencies in the current cargo workspace that are
+# git references containing a revision/commit sha.
+cargo metadata --format-version 1 --no-deps \
+  | jq -r '[.packages[].dependencies] | flatten | [.[] | .source | select(. != null) | select(. | startswith("git+")) | select(. | contains("?rev=")) | sub("^git\\+"; "") | split("?rev=")] | unique | sort | .[] | @tsv' \
+  | {
+    fails=0
+    while IFS=$'\t' read -r repo sha; do
+      # For each, clone the repo, checkout the default branch and tags, and check
+      # that the commit can be found in at least one of them.
+      temp=$(mktemp -d)
+      echo -e "\033[1;34mChecking "$repo" @ "$sha"\033[0m"
+      git clone "$repo" "$temp"
+      pushd "$temp"
+      found=0
+      for ref in . $(git tag); do
+        git -c advice.detachedHead=false checkout "$ref"
+        desc="$(git describe --all)"
+        echo -e "\033[1;33mChecking is in "$desc"\033[0m"
+        if git merge-base --is-ancestor "$sha" HEAD; then
+          echo -e "\033[1;32mCommit is in the history of $desc.\033[0m"
+          found=1
+        else
+          echo -e "Commit is NOT in the history of $desc."
+        fi
+      done
+      if (( $found == 0 )); then
+        fails=1
+      fi
+      popd
+    done
+    if (( $fails > 0 )); then
+      echo -e "\033[1;31mDependency revisions must reference a version of the dependency that is on the default branch, or a tag, so that they do not become orphaned.\033[0m"
+      exit 1
+    fi
+  }