diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index 7c41682..440827b 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -16,13 +16,23 @@ jobs:
           if [[ "${{steps.output-set.outputs.result}}" != "output" ]]; then
             exit 1
           fi
-      - id: file-output-set
+      - id: file-relative
         uses: actions/github-script@run-file
         with:
           file: __test__/test-output.js
           result-encoding: string
           input-value: output
       - run: |
-          if [[ "${{steps.file-output-set.outputs.result}}" != "output" ]]; then
+          if [[ "${{steps.file-relative.outputs.result}}" != "output" ]]; then
+            exit 1
+          fi
+      - id: file-absolute
+        uses: actions/github-script@run-file
+        with:
+          file: ${{github.workspace}}/__test__/test-output.js
+          result-encoding: string
+          input-value: output
+      - run: |
+          if [[ "${{steps.file-absolute.outputs.result}}" != "output" ]]; then
             exit 1
           fi
diff --git a/dist/index.js b/dist/index.js
index 02c4f48..4c0da40 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -9273,6 +9273,12 @@ var core = __webpack_require__(470);
 // EXTERNAL MODULE: ./node_modules/@actions/github/lib/github.js
 var lib_github = __webpack_require__(469);
 
+// EXTERNAL MODULE: external "fs"
+var external_fs_ = __webpack_require__(747);
+
+// EXTERNAL MODULE: external "path"
+var external_path_ = __webpack_require__(622);
+
 // CONCATENATED MODULE: ./src/async-function.ts
 const AsyncFunction = Object.getPrototypeOf(async () => null).constructor;
 function callAsyncFunction(args, source) {
@@ -9284,6 +9290,8 @@ function callAsyncFunction(args, source) {
 
 
 
+
+
 process.on('unhandledRejection', handleError);
 main().catch(handleError);
 async function main() {
@@ -9299,7 +9307,7 @@ async function main() {
     if (previews != null)
         opts.previews = previews.split(',');
     const github = new lib_github.GitHub(token, opts);
-    const script = Object(core.getInput)('script', { required: true });
+    const script = getScript();
     // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
     const result = await callAsyncFunction({ require: __webpack_require__(875), github, context: lib_github.context, core: core }, script);
     let encoding = Object(core.getInput)('result-encoding');
@@ -9317,6 +9325,22 @@ async function main() {
     }
     Object(core.setOutput)('result', output);
 }
+function getScript() {
+    const script = Object(core.getInput)('script');
+    const filePath = Object(core.getInput)('file');
+    if (script && filePath) {
+        Object(core.setFailed)('A script and a file were provided; only one is allowed');
+        process.exit(1);
+    }
+    if (!(script || filePath)) {
+        Object(core.setFailed)('Neither a script nor a file were provided');
+        process.exit(1);
+    }
+    if (filePath) {
+        return Object(external_fs_.readFileSync)(Object(external_path_.resolve)(filePath)).toString('utf-8');
+    }
+    return script;
+}
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 function handleError(err) {
     console.error(err);
diff --git a/src/main.ts b/src/main.ts
index becbc56..2abdcac 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,5 +1,7 @@
 import * as core from '@actions/core'
 import {context, GitHub} from '@actions/github'
+import * as fs from 'fs'
+import * as path from 'path'
 import {callAsyncFunction} from './async-function'
 
 process.on('unhandledRejection', handleError)
@@ -23,7 +25,7 @@ async function main(): Promise<void> {
   if (previews != null) opts.previews = previews.split(',')
 
   const github = new GitHub(token, opts)
-  const script = core.getInput('script', {required: true})
+  const script = getScript()
 
   // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
   const result = await callAsyncFunction(
@@ -50,6 +52,27 @@ async function main(): Promise<void> {
   core.setOutput('result', output)
 }
 
+function getScript(): string {
+  const script = core.getInput('script')
+  const filePath = core.getInput('file')
+
+  if (script && filePath) {
+    core.setFailed('A script and a file were provided; only one is allowed')
+    process.exit(1)
+  }
+
+  if (!(script || filePath)) {
+    core.setFailed('Neither a script nor a file were provided')
+    process.exit(1)
+  }
+
+  if (filePath) {
+    return fs.readFileSync(path.resolve(filePath)).toString('utf-8')
+  }
+
+  return script
+}
+
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 function handleError(err: any): void {
   console.error(err)