diff --git a/.github/workflows/libcxx-trigger-buildkite.yaml b/.github/workflows/libcxx-trigger-buildkite.yaml
new file mode 100644
index 0000000000000..d274f027838c7
--- /dev/null
+++ b/.github/workflows/libcxx-trigger-buildkite.yaml
@@ -0,0 +1,37 @@
+# This workflow triggers the Buildkite pipeline for libc++.
+#
+# The Buildkite pipeline implements pre-commit CI checks on platforms
+# where the Github actions runner can't be used.
+
+name: "[libc++] Trigger Buildkite pipeline"
+on:
+  pull_request_target:
+    paths:
+      - 'libcxx/**'
+      - 'libcxxabi/**'
+      - 'libunwind/**'
+      - 'runtimes/**'
+      - 'cmake/**'
+  schedule:
+    # Run nightly at 08:00 UTC (aka 00:00 Pacific, aka 03:00 Eastern)
+    - cron: '0 8 * * *'
+
+permissions:
+  contents: read # Default everything to read-only
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  trigger_buildkite:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Buildkite pipeline
+        uses: buildkite/trigger-pipeline-action@f0dcd5ae74452a8d17d473227c9d212dcc1eb8f9 # v2.4.0
+        with:
+          buildkite_api_access_token: ${{ secrets.BUILDKITE_API_ACCESS_TOKEN }}
+          pipeline: llvm-project/libcxx-ci
+          branch: ${{ github.ref_name }}
+          commit: ${{ github.sha }}
+          message: "Triggered by GitHub Actions PR against ${{ github.ref_name }}"
diff --git a/libcxx/utils/ci/buildkite-pipeline-trigger.sh b/libcxx/utils/ci/buildkite-pipeline-trigger.sh
deleted file mode 100755
index 4661cd54fad42..0000000000000
--- a/libcxx/utils/ci/buildkite-pipeline-trigger.sh
+++ /dev/null
@@ -1,34 +0,0 @@
-# ===----------------------------------------------------------------------===##
-#
-# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-# See https://llvm.org/LICENSE.txt for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-#
-# ===----------------------------------------------------------------------===##
-
-#
-# This script determines whether the libc++ Buildkite pipeline should be triggered
-# on a change. This is required because Buildkite gets notified for every PR in the
-# LLVM monorepo, and we make it a no-op unless the libc++ pipeline needs to be triggered.
-#
-
-# Set by buildkite
-: ${BUILDKITE_PULL_REQUEST_BASE_BRANCH:=}
-
-# Fetch origin to have an up to date merge base for the diff.
-git fetch origin
-# List of files affected by this commit
-: ${MODIFIED_FILES:=$(git diff --name-only origin/${BUILDKITE_PULL_REQUEST_BASE_BRANCH}...HEAD)}
-
-echo "Files modified:" >&2
-echo "$MODIFIED_FILES" >&2
-modified_dirs=$(echo "$MODIFIED_FILES" | cut -d'/' -f1 | sort -u)
-echo "Directories modified:" >&2
-echo "$modified_dirs" >&2
-
-# If libc++ or one of the runtimes directories changed, trigger the libc++ Buildkite pipeline.
-if echo "$modified_dirs" | grep -q -E "^(libcxx|libcxxabi|libunwind|runtimes|cmake)$"; then
-    buildkite-agent pipeline upload libcxx/utils/ci/buildkite-pipeline.yml
-else
-    echo "No Buildkite jobs to trigger"
-fi