diff --git a/.changeset/cuddly-baboons-add.md b/.changeset/cuddly-baboons-add.md
new file mode 100644
index 00000000..953cdeed
--- /dev/null
+++ b/.changeset/cuddly-baboons-add.md
@@ -0,0 +1,5 @@
+---
+'@capacitor-firebase/functions': minor
+---
+
+feat(functions): add `regionOrCustomDomain` option to `UseEmulatorOptions`
diff --git a/packages/functions/README.md b/packages/functions/README.md
index 7693517f..a04157d1 100644
--- a/packages/functions/README.md
+++ b/packages/functions/README.md
@@ -179,10 +179,11 @@ On Android, the cleartext traffic must be allowed. On the Capacitor configuratio
 
 #### UseEmulatorOptions
 
-| Prop       | Type                | Description                                                                                                                                                                     | Default           | Since |
-| ---------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- | ----- |
-| **`host`** | <code>string</code> | The emulator host without any port or scheme. Note when using a Android Emulator device: 10.0.2.2 is the special IP address to connect to the 'localhost' of the host computer. |                   | 6.1.0 |
-| **`port`** | <code>number</code> | The emulator port.                                                                                                                                                              | <code>5001</code> | 6.1.0 |
+| Prop                       | Type                | Description                                                                                                                                                                     | Default           | Since |
+| -------------------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- | ----- |
+| **`host`**                 | <code>string</code> | The emulator host without any port or scheme. Note when using a Android Emulator device: 10.0.2.2 is the special IP address to connect to the 'localhost' of the host computer. |                   | 6.1.0 |
+| **`port`**                 | <code>number</code> | The emulator port.                                                                                                                                                              | <code>5001</code> | 6.1.0 |
+| **`regionOrCustomDomain`** | <code>string</code> | one of: a) The region the callable functions are located in (ex: us-central1) b) A custom domain hosting the callable functions (ex: https://mydomain.com)                      |                   |       |
 
 
 ### Type Aliases
diff --git a/packages/functions/src/definitions.ts b/packages/functions/src/definitions.ts
index 01a84ee4..6e5e73ff 100644
--- a/packages/functions/src/definitions.ts
+++ b/packages/functions/src/definitions.ts
@@ -123,4 +123,11 @@ export interface UseEmulatorOptions {
    * @example 5001
    */
   port?: number;
+  /**
+   * The region the callable functions are located in or a custom domain hosting the callable functions.
+   *
+   * @example 'us-central1'
+   * @example 'https://mydomain.com'
+   */
+  regionOrCustomDomain?: string;
 }
diff --git a/packages/functions/src/web.ts b/packages/functions/src/web.ts
index cdb4af3b..533f693e 100644
--- a/packages/functions/src/web.ts
+++ b/packages/functions/src/web.ts
@@ -48,7 +48,7 @@ export class FirebaseFunctionsWeb
   }
 
   public async useEmulator(options: UseEmulatorOptions): Promise<void> {
-    const functions = getFunctions();
+    const functions = getFunctions(undefined, options.regionOrCustomDomain);
     const port = options.port || 5001;
     connectFunctionsEmulator(functions, options.host, port);
   }