diff --git a/README.md b/README.md
index fb9a485..92a422d 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ Helper for parsing inputs in a GitHub Action
 - Throws errors if input is set to [required](#required-inputs) and is missing
 - Uses local environment variables (and `.env` files) during [development](#development)
 - Specify a [custom function](#modify-the-parsed-input) for advanced parsing
+- Supports [array of keys](#key)
 
 ## 🚀 Get started
 
@@ -83,13 +84,19 @@ Here are all the options you can use and there default values:
 
 | Name | Description | Required | Default |
 | ------------- | ------------- | ------------- | ------------- |
-| `key` | The key of the input option | **Yes** | N/A |
+| `key` | The key of the input option (can also be an array of keys) | **Yes** | N/A |
 | `type` | The type of the input value (`string`/`boolean`/`number`/`array`) | **No** | `string` |
 | `required` | Specify if the input is required | **No** | false |
 | `default` | Specify a default value for the input | **No** | N/A |
 | `disableable` | Specify if the input should be able to be disabled by setting it to `false` | **No** | `false` |
 | `modifier` | A function which gets passed the parsed value as a parameter and returns another value  | **No** | N/A |
 
+### Key
+
+You can either specify a single key as a string, or multiple keys as an array of strings.
+
+[See example](#multiple-keys)
+
 ### Types
 
 You can specify one of the following types which will determine how the input is parsed:
@@ -246,6 +253,20 @@ const value = parser.getInput({
 // Value will be undefined because labels was set to false
 ```
 
+### Multiple Keys
+
+Action code:
+
+```js
+const parser = require('action-input-parser')
+
+const value = parser.getInput({ 
+    key: [ 'GITHUB_TOKEN', 'GH_PAT' ]
+})
+
+// The first key takes precedence
+```
+
 ### Modify the parsed input
 
 Action Workflow:
diff --git a/lib/index.d.ts b/lib/index.d.ts
index a39adef..0ab348e 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -1,2 +1,2 @@
 import { IOpts, InputValue } from './types';
-export declare const getInput: (key: string | IOpts, opts: IOpts) => InputValue;
+export declare const getInput: (key: string | Array<string> | IOpts, opts: IOpts) => InputValue;
diff --git a/lib/index.js b/lib/index.js
index 925f899..19fcecb 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -62,7 +62,7 @@ var parseValue = function (val, type) {
 };
 var getInput = function (key, opts) {
     var parsedOptions;
-    if (typeof key === 'string') {
+    if (typeof key === 'string' || Array.isArray(key)) {
         parsedOptions = __assign({ key: key }, opts);
     }
     else if (typeof key === 'object') {
@@ -76,7 +76,7 @@ var getInput = function (key, opts) {
     var options = Object.assign({}, DEFAULT_OPTIONS, parsedOptions);
     if (VALID_TYPES.includes(options.type) === false)
         throw new Error('option type has to be one of `string | array | boolean | number`');
-    var val = getEnvVar(options.key);
+    var val = typeof options.key === 'string' ? getEnvVar(options.key) : options.key.map(function (key) { return getEnvVar(key); }).filter(function (item) { return item; })[0];
     if (options.disableable && val === 'false')
         return undefined;
     var parsed = val !== undefined ? parseValue(val, options.type) : undefined;
diff --git a/lib/types.d.ts b/lib/types.d.ts
index 073c190..7ff7f2c 100644
--- a/lib/types.d.ts
+++ b/lib/types.d.ts
@@ -1,7 +1,7 @@
 declare type ModifierFunction = (val: InputValue) => InputValue;
 export declare type InputValue = undefined | string | boolean | number | Array<string | boolean | number>;
 export interface IOpts {
-    key?: string;
+    key?: string | Array<string>;
     type?: string;
     required?: boolean;
     disableable?: boolean;
@@ -9,7 +9,7 @@ export interface IOpts {
     modifier?: ModifierFunction;
 }
 export interface IParsedOpts {
-    key: string;
+    key: string | Array<string>;
     type: string;
     required: boolean;
     disableable: boolean;
diff --git a/src/index.ts b/src/index.ts
index 35f59b1..109abb4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -59,9 +59,9 @@ const parseValue = (val: string, type: string): InputValue => {
 	return val.trim()
 }
 
-export const getInput = (key: string | IOpts, opts: IOpts): InputValue => {
+export const getInput = (key: string | Array<string> | IOpts, opts: IOpts): InputValue => {
 	let parsedOptions: IOpts
-	if (typeof key === 'string') {
+	if (typeof key === 'string' || Array.isArray(key)) {
 		parsedOptions = {
 			key: key,
 			...opts
@@ -78,7 +78,7 @@ export const getInput = (key: string | IOpts, opts: IOpts): InputValue => {
 
 	if (VALID_TYPES.includes(options.type) === false) throw new Error('option type has to be one of `string | array | boolean | number`')
 
-	const val = getEnvVar(options.key)
+	const val = typeof options.key === 'string' ? getEnvVar(options.key) : options.key.map((key) => getEnvVar(key)).filter((item) => item)[0]
 
 	if (options.disableable && val === 'false') return undefined
 
diff --git a/src/types.ts b/src/types.ts
index 18223a4..f5529a6 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -4,7 +4,7 @@ type ModifierFunction = (val: InputValue) => InputValue
 export type InputValue = undefined | string | boolean | number | Array<string | boolean | number>
 
 export interface IOpts {
-    key?: string
+    key?: string | Array<string>
     type?: string
     required?: boolean,
     disableable?: boolean
@@ -13,7 +13,7 @@ export interface IOpts {
 }
 
 export interface IParsedOpts {
-    key: string
+    key: string | Array<string>
     type: string
     required: boolean,
     disableable: boolean