diff --git a/.github/workflows/clang-tests.yml b/.github/workflows/clang-tests.yml
--- a/.github/workflows/clang-tests.yml
+++ b/.github/workflows/clang-tests.yml
@@ -14,6 +14,12 @@
       - 'llvm/**'
       - '.github/workflows/clang-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   build_clang:
     name: clang check-all
diff --git a/.github/workflows/libclang-abi-tests.yml b/.github/workflows/libclang-abi-tests.yml
--- a/.github/workflows/libclang-abi-tests.yml
+++ b/.github/workflows/libclang-abi-tests.yml
@@ -12,6 +12,13 @@
       - 'clang/**'
       - '.github/workflows/libclang-abi-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+
 jobs:
   abi-dump-setup:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/libclc-tests.yml b/.github/workflows/libclc-tests.yml
--- a/.github/workflows/libclc-tests.yml
+++ b/.github/workflows/libclc-tests.yml
@@ -16,6 +16,13 @@
       - 'libclc/**'
       - '.github/workflows/libclc-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+
 jobs:
   build_libclc:
     name: libclc test
diff --git a/.github/workflows/lld-tests.yml b/.github/workflows/lld-tests.yml
--- a/.github/workflows/lld-tests.yml
+++ b/.github/workflows/lld-tests.yml
@@ -14,6 +14,12 @@
       - 'llvm/**'
       - '.github/workflows/lld-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   build_lld:
     name: lld check-all
diff --git a/.github/workflows/lldb-tests.yml b/.github/workflows/lldb-tests.yml
--- a/.github/workflows/lldb-tests.yml
+++ b/.github/workflows/lldb-tests.yml
@@ -16,6 +16,13 @@
       - 'lldb/**'
       - '.github/workflows/lldb-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+
 jobs:
   build_lldb:
     name: lldb build
diff --git a/.github/workflows/llvm-tests.yml b/.github/workflows/llvm-tests.yml
--- a/.github/workflows/llvm-tests.yml
+++ b/.github/workflows/llvm-tests.yml
@@ -12,6 +12,13 @@
       - 'llvm/**'
       - '.github/workflows/llvm-tests.yml'
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+
 jobs:
   build_llvm:
     name: llvm check-all