diff --git a/README.md b/README.md
index 71f375e..9346948 100644
--- a/README.md
+++ b/README.md
@@ -7,10 +7,12 @@ Qualcomm PR email addresses checker
 For each commit in a PR, validates that the commit's author and committer email
 addresses are appropriate for the repo.
 
-**NOTE:** This action should be used with `pull_request` or
-`pull_request_target` events. It exits successfully without checking anything
-for other event types during normal execution. The `--test` option intentionally
-uses fixture data regardless of the event type.
+**NOTE:** This action should be used with `pull_request`,
+`pull_request_target`, or `workflow_run` events. For `workflow_run` events, it
+checks all pull requests associated with a workflow whose triggering event is a
+pull request event. It exits successfully without checking anything for other
+event types during normal execution. The `--test` option intentionally uses
+fixture data regardless of the event type.
 
 ## Example Usage
 
diff --git a/action.yml b/action.yml
index 78598b8..fb349dc 100644
--- a/action.yml
+++ b/action.yml
@@ -12,3 +12,4 @@ runs:
         GITHUB_TOKEN: ${{ github.token }}
         PULL_NUMBER: ${{ github.event.number }}
         COMMITS_COUNT: ${{ github.event.pull_request.commits }}
+        WORKFLOW_RUN_EVENT: ${{ github.event.workflow_run.event }}
diff --git a/check_email_pr.sh b/check_email_pr.sh
index 62154f7..34a4a22 100755
--- a/check_email_pr.sh
+++ b/check_email_pr.sh
@@ -9,6 +9,32 @@ MYDIR=$(dirname -- "$MYPROG")
 debug() { echo "::debug::$1" >&2 ; } # message
 error() { echo "::error::$1" >&2 ; } # message
 
+# Make an authenticated request to the GitHub REST API.
+github_api_get() {
+    local endpoint=$1
+    debug "Getting data from $endpoint"
+    local debug_opts=()
+    [ -n "$RUNNER_DEBUG" ] && debug_opts=("--verbose" "--progress-meter" "--show-error")
+    curl -L --no-progress-meter --fail-with-body \
+        "${debug_opts[@]}" \
+        -H "Accept: application/vnd.github+json" \
+        -H "Authorization: Bearer $GITHUB_TOKEN" \
+        -H "X-GitHub-Api-Version: 2022-11-28" \
+        "$endpoint"
+}
+
+# https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#get-a-pull-request
+get_pr_metadata() {
+    local endpoint="$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/pulls/$PULL_NUMBER"
+    local metadata
+    metadata=$(github_api_get "$endpoint") || return 1
+    COMMITS_COUNT=$(jq -r '.commits // empty' <<< "$metadata")
+    if [ -z "$COMMITS_COUNT" ] ; then
+        error "Cannot determine commit count for pull request $PULL_NUMBER"
+        return 1
+    fi
+}
+
 # https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#list-commits-on-a-pull-request
 get_pr_commits() {
     if [ -n "$TEST_MODE" ] ; then
@@ -20,15 +46,7 @@ get_pr_commits() {
     # TODO: Handle paginated results
     # https://docs.github.com/en/rest/using-the-rest-api/using-pagination-in-the-rest-api?apiVersion=2022-11-28#using-link-headers
     local endpoint="$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/pulls/$PULL_NUMBER/commits?per_page=$COMMITS_COUNT"
-    debug "Getting commits from $endpoint"
-    local debug_opts=()
-    [ -n "$RUNNER_DEBUG" ] && debug_opts=("--verbose" "--progress-meter" "--show-error")
-    curl -L --no-progress-meter --fail-with-body \
-        "${debug_opts[@]}" \
-        -H "Accept: application/vnd.github+json" \
-        -H "Authorization: Bearer $GITHUB_TOKEN" \
-        -H "X-GitHub-Api-Version: 2022-11-28" \
-        "$endpoint"
+    github_api_get "$endpoint"
 }
 
 # https://docs.github.com/en/rest/repos/custom-properties?apiVersion=2022-11-28#get-all-custom-property-values-for-a-repository
@@ -69,10 +87,36 @@ EOF
 is_pr_event() {
     case "${GITHUB_EVENT_NAME:-}" in
         pull_request|pull_request_target) return 0 ;;
+        workflow_run)
+            case "${WORKFLOW_RUN_EVENT:-}" in
+                pull_request|pull_request_target) return 0 ;;
+            esac
+            return 1
+            ;;
         *) return 1 ;;
     esac
 }
 
+get_pr_numbers() {
+    if [ "${GITHUB_EVENT_NAME:-}" = "workflow_run" ] ; then
+        jq -r '.workflow_run.pull_requests[]?.number // empty' "$GITHUB_EVENT_PATH"
+    else
+        echo "$PULL_NUMBER"
+    fi
+}
+
+check_pr_commits() {
+    local result=0
+    while read -r pr_commit ; do
+        debug "Running check on: $pr_commit"
+        "$MYDIR"/src/check_email.sh \
+            --commit-json "$pr_commit" \
+            --custom-properties-json "$custom_properties" \
+            "${TEST_MODE[@]}" || result=1
+    done < <(get_pr_commits | split_commits_and_add_metadata)
+    return "$result"
+}
+
 TEST_MODE=()
 while [ $# -gt 0 ] ; do
     case "$1" in
@@ -87,14 +131,39 @@ if [ "${#TEST_MODE[@]}" -eq 0 ] && ! is_pr_event ; then
     exit 0
 fi
 
+if [ "${#TEST_MODE[@]}" -gt 0 ] ; then
+    custom_properties=$(get_custom_properties)
+    check_pr_commits
+    exit $?
+fi
+
+if [ "${GITHUB_EVENT_NAME:-}" = "workflow_run" ] && \
+        { [ -z "${GITHUB_EVENT_PATH:-}" ] || [ ! -r "$GITHUB_EVENT_PATH" ]; } ; then
+    error "Cannot read workflow_run event payload"
+    exit 1
+fi
+
+PR_NUMBERS=$(get_pr_numbers) || {
+    error "Cannot determine pull requests from workflow_run event payload"
+    exit 1
+}
+
+if [ -z "$PR_NUMBERS" ] ; then
+    debug "Skipping email check: workflow_run has no associated pull requests"
+    exit 0
+fi
+
 RESULT=0
 custom_properties=$(get_custom_properties)
-while read -r pr_commit ; do
-    debug "Running check on: $pr_commit"
-    "$MYDIR"/src/check_email.sh \
-        --commit-json "$pr_commit" \
-        --custom-properties-json "$custom_properties" \
-        "${TEST_MODE[@]}" || RESULT=1
-done < <(get_pr_commits | split_commits_and_add_metadata)
+while read -r PULL_NUMBER ; do
+    [ -n "$PULL_NUMBER" ] || continue
+    if [ "${GITHUB_EVENT_NAME:-}" = "workflow_run" ] ; then
+        get_pr_metadata || {
+            RESULT=1
+            continue
+        }
+    fi
+    check_pr_commits || RESULT=1
+done <<< "$PR_NUMBERS"
 
 exit $RESULT
diff --git a/test/check_event_types.sh b/test/check_event_types.sh
index c06821f..3ec2c59 100755
--- a/test/check_event_types.sh
+++ b/test/check_event_types.sh
@@ -49,8 +49,71 @@ run_pull_request_event_test() {
     grep -q 'Running check on:' <<< "$output"
 }
 
+run_workflow_run_pull_request_test() {
+    local event output status
+    event=$1
+
+    if output=$(env -u TEST_MODE \
+        GITHUB_EVENT_PATH="$ROOT_DIR/test/workflow_run_event.json" \
+        GITHUB_API_URL=https://api.example.com \
+        GITHUB_EVENT_NAME=workflow_run \
+        WORKFLOW_RUN_EVENT="$event" \
+        PATH="$ROOT_DIR/test/fake_bin/workflow_run:$PATH" \
+        "$ROOT_DIR/check_email_pr.sh" 2>&1) ; then
+        status=0
+    else
+        status=$?
+    fi
+
+    [ "$status" -eq 0 ]
+    [ "$(grep -c 'Running check on:' <<< "$output")" -eq 4 ]
+}
+
+run_workflow_run_non_pr_event_test() {
+    local output status
+
+    if output=$(env -u TEST_MODE -u PULL_NUMBER -u COMMITS_COUNT \
+        GITHUB_EVENT_PATH="$ROOT_DIR/test/workflow_run_event.json" \
+        GITHUB_API_URL= \
+        GITHUB_EVENT_NAME=workflow_run \
+        WORKFLOW_RUN_EVENT=push \
+        PATH="$ROOT_DIR/test/fake_bin:$PATH" \
+        "$ROOT_DIR/check_email_pr.sh" 2>&1) ; then
+        status=0
+    else
+        status=$?
+    fi
+
+    [ "$status" -eq 0 ]
+    ! grep -q 'curl was called' <<< "$output"
+    ! grep -q 'jq was called' <<< "$output"
+}
+
+run_workflow_run_empty_pull_requests_test() {
+    local output status
+
+    if output=$(env -u TEST_MODE -u PULL_NUMBER -u COMMITS_COUNT \
+        GITHUB_EVENT_PATH="$ROOT_DIR/test/workflow_run_empty_pull_requests_event.json" \
+        GITHUB_API_URL=https://api.example.com \
+        GITHUB_EVENT_NAME=workflow_run \
+        WORKFLOW_RUN_EVENT=pull_request \
+        PATH="$ROOT_DIR/test/fake_bin/workflow_run:$PATH" \
+        "$ROOT_DIR/check_email_pr.sh" 2>&1) ; then
+        status=0
+    else
+        status=$?
+    fi
+
+    [ "$status" -eq 0 ]
+    grep -q 'no associated pull requests' <<< "$output"
+}
+
 for event in push workflow_dispatch schedule unset ; do
     run_non_pr_event_test "$event"
 done
 run_pull_request_event_test pull_request
 run_pull_request_event_test pull_request_target
+run_workflow_run_pull_request_test pull_request
+run_workflow_run_pull_request_test pull_request_target
+run_workflow_run_non_pr_event_test
+run_workflow_run_empty_pull_requests_test
diff --git a/test/fake_bin/workflow_run/curl b/test/fake_bin/workflow_run/curl
new file mode 100755
index 0000000..3d5f93e
--- /dev/null
+++ b/test/fake_bin/workflow_run/curl
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+endpoint=${@: -1}
+
+case "$endpoint" in
+    */pulls/101|*/pulls/202)
+        echo '{"commits": 2}'
+        ;;
+    */pulls/101/commits\?per_page=2|*/pulls/202/commits\?per_page=2)
+        cat "$(cd -- "$(dirname -- "$0")/../.." && pwd)/pr_list_commits.json"
+        ;;
+    *)
+        echo "Unexpected endpoint: $endpoint" >&2
+        exit 1
+        ;;
+esac
diff --git a/test/workflow_run_empty_pull_requests_event.json b/test/workflow_run_empty_pull_requests_event.json
new file mode 100644
index 0000000..38981aa
--- /dev/null
+++ b/test/workflow_run_empty_pull_requests_event.json
@@ -0,0 +1,6 @@
+{
+  "workflow_run": {
+    "event": "pull_request",
+    "pull_requests": []
+  }
+}
diff --git a/test/workflow_run_event.json b/test/workflow_run_event.json
new file mode 100644
index 0000000..2f20926
--- /dev/null
+++ b/test/workflow_run_event.json
@@ -0,0 +1,31 @@
+{
+  "workflow_run": {
+    "event": "pull_request",
+    "pull_requests": [
+      {
+        "number": 101,
+        "url": "https://api.github.com/repos/example/example/pulls/101",
+        "head": {
+          "ref": "feature-one",
+          "sha": "1111111111111111111111111111111111111111"
+        },
+        "base": {
+          "ref": "main",
+          "sha": "2222222222222222222222222222222222222222"
+        }
+      },
+      {
+        "number": 202,
+        "url": "https://api.github.com/repos/example/example/pulls/202",
+        "head": {
+          "ref": "feature-two",
+          "sha": "3333333333333333333333333333333333333333"
+        },
+        "base": {
+          "ref": "main",
+          "sha": "4444444444444444444444444444444444444444"
+        }
+      }
+    ]
+  }
+}