diff --git a/src/js/_enqueues/admin/auth-app.js b/src/js/_enqueues/admin/auth-app.js
index 808bb0754b..3152ed3c5c 100644
--- a/src/js/_enqueues/admin/auth-app.js
+++ b/src/js/_enqueues/admin/auth-app.js
@@ -16,7 +16,8 @@
 		};
 
 	$approveBtn.click( function( e ) {
-		var name = $appNameField.val();
+		var name = $appNameField.val(),
+			appId = $( 'input[name="app_id"]', $form ).val();
 
 		e.preventDefault();
 
@@ -32,6 +33,10 @@
 			name: name
 		};
 
+		if ( appId.length > 0 ) {
+			request.app_id = appId;
+		}
+
 		/**
 		 * Filters the request data used to Authorize an Application Password request.
 		 *
diff --git a/src/wp-admin/authorize-application.php b/src/wp-admin/authorize-application.php
index 88804b7d74..b9cc0c0aac 100644
--- a/src/wp-admin/authorize-application.php
+++ b/src/wp-admin/authorize-application.php
@@ -18,6 +18,7 @@ if ( isset( $_POST['action'] ) && 'authorize_application_password' === $_POST['a
 	$success_url = $_POST['success_url'];
 	$reject_url  = $_POST['reject_url'];
 	$app_name    = $_POST['app_name'];
+	$app_id      = $_POST['app_id'];
 	$redirect    = '';
 
 	if ( isset( $_POST['reject'] ) ) {
@@ -27,7 +28,13 @@ if ( isset( $_POST['action'] ) && 'authorize_application_password' === $_POST['a
 			$redirect = admin_url();
 		}
 	} elseif ( isset( $_POST['approve'] ) ) {
-		$created = WP_Application_Passwords::create_new_application_password( get_current_user_id(), array( 'name' => $app_name ) );
+		$created = WP_Application_Passwords::create_new_application_password(
+			get_current_user_id(),
+			array(
+				'name'   => $app_name,
+				'app_id' => $app_id,
+			)
+		);
 
 		if ( is_wp_error( $created ) ) {
 			$error = $created;
@@ -56,6 +63,7 @@ if ( isset( $_POST['action'] ) && 'authorize_application_password' === $_POST['a
 $title = __( 'Authorize Application' );
 
 $app_name    = ! empty( $_REQUEST['app_name'] ) ? $_REQUEST['app_name'] : '';
+$app_id      = ! empty( $_REQUEST['app_id'] ) ? $_REQUEST['app_id'] : '';
 $success_url = ! empty( $_REQUEST['success_url'] ) ? $_REQUEST['success_url'] : null;
 
 if ( ! empty( $_REQUEST['reject_url'] ) ) {
@@ -68,7 +76,7 @@ if ( ! empty( $_REQUEST['reject_url'] ) ) {
 
 $user = wp_get_current_user();
 
-$request  = compact( 'app_name', 'success_url', 'reject_url' );
+$request  = compact( 'app_name', 'app_id', 'success_url', 'reject_url' );
 $is_valid = wp_is_authorize_application_password_request_valid( $request, $user );
 
 if ( is_wp_error( $is_valid ) ) {
@@ -183,6 +191,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 			<form action="<?php echo esc_url( admin_url( 'authorize-application.php' ) ); ?>" method="post">
 				<?php wp_nonce_field( 'authorize_application_password' ); ?>
 				<input type="hidden" name="action" value="authorize_application_password" />
+				<input type="hidden" name="app_id" value="<?php echo esc_attr( $app_id ); ?>" />
 				<input type="hidden" name="success_url" value="<?php echo esc_url( $success_url ); ?>" />
 				<input type="hidden" name="reject_url" value="<?php echo esc_url( $reject_url ); ?>" />
 
diff --git a/src/wp-admin/includes/user.php b/src/wp-admin/includes/user.php
index d519ee75bc..a08fe3f4b2 100644
--- a/src/wp-admin/includes/user.php
+++ b/src/wp-admin/includes/user.php
@@ -604,6 +604,7 @@ Please click the following link to activate your user account:
  *     The array of request data. All arguments are optional and may be empty.
  *
  *     @type string $app_name    The suggested name of the application.
+ *     @type string $app_id      A uuid provided by the application to uniquely identify it.
  *     @type string $success_url The url the user will be redirected to after approving the application.
  *     @type string $reject_url  The url the user will be redirected to after rejecting the application.
  * }
@@ -635,6 +636,13 @@ function wp_is_authorize_application_password_request_valid( $request, $user ) {
 		}
 	}
 
+	if ( ! empty( $request['app_id'] ) && ! wp_is_uuid( $request['app_id'] ) ) {
+		$error->add(
+			'invalid_app_id',
+			__( 'The app id must be a uuid.' )
+		);
+	}
+
 	/**
 	 * Fires before application password errors are returned.
 	 *
diff --git a/src/wp-includes/class-wp-application-passwords.php b/src/wp-includes/class-wp-application-passwords.php
index 876ffbed18..4500a571d8 100644
--- a/src/wp-includes/class-wp-application-passwords.php
+++ b/src/wp-includes/class-wp-application-passwords.php
@@ -51,6 +51,7 @@ class WP_Application_Passwords {
 
 		$new_item = array(
 			'uuid'      => wp_generate_uuid4(),
+			'app_id'    => empty( $args['app_id'] ) ? '' : $args['app_id'],
 			'name'      => $args['name'],
 			'password'  => $hashed_password,
 			'created'   => time(),
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-application-passwords-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-application-passwords-controller.php
index fdb496b412..123722a793 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-application-passwords-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-application-passwords-controller.php
@@ -412,6 +412,10 @@ class WP_REST_Application_Passwords_Controller extends WP_REST_Controller {
 			'name' => $request['name'],
 		);
 
+		if ( $request['app_id'] && ! $request['uuid'] ) {
+			$prepared->app_id = $request['app_id'];
+		}
+
 		/**
 		 * Filters an application password before it is inserted via the REST API.
 		 *
@@ -441,6 +445,7 @@ class WP_REST_Application_Passwords_Controller extends WP_REST_Controller {
 
 		$prepared = array(
 			'uuid'      => $item['uuid'],
+			'app_id'    => empty( $item['app_id'] ) ? '' : $item['app_id'],
 			'name'      => $item['name'],
 			'created'   => gmdate( 'Y-m-d\TH:i:s', $item['created'] ),
 			'last_used' => $item['last_used'] ? gmdate( 'Y-m-d\TH:i:s', $item['last_used'] ) : null,
@@ -615,6 +620,12 @@ class WP_REST_Application_Passwords_Controller extends WP_REST_Controller {
 					'context'     => array( 'view', 'edit', 'embed' ),
 					'readonly'    => true,
 				),
+				'app_id'    => array(
+					'description' => __( 'A uuid provided by the application to uniquely identify it. It is recommended to use an UUID v5 with the URL or DNS namespace.' ),
+					'type'        => 'string',
+					'format'      => 'uuid',
+					'context'     => array( 'view', 'edit', 'embed' ),
+				),
 				'name'      => array(
 					'description' => __( 'The name of the application password.' ),
 					'type'        => 'string',
diff --git a/tests/phpunit/tests/rest-api/rest-application-passwords-controller.php b/tests/phpunit/tests/rest-api/rest-application-passwords-controller.php
index c799634e27..33d21e6a20 100644
--- a/tests/phpunit/tests/rest-api/rest-application-passwords-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-application-passwords-controller.php
@@ -308,8 +308,14 @@ class WP_Test_REST_Application_Passwords_Controller extends WP_Test_REST_Control
 	public function test_create_item() {
 		wp_set_current_user( self::$admin );
 
+		$app_id  = wp_generate_uuid4();
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users/me/application-passwords' );
-		$request->set_body_params( array( 'name' => 'App' ) );
+		$request->set_body_params(
+			array(
+				'name'   => 'App',
+				'app_id' => $app_id,
+			)
+		);
 		$response = rest_do_request( $request );
 
 		$this->assertEquals( 201, $response->get_status() );
@@ -318,6 +324,7 @@ class WP_Test_REST_Application_Passwords_Controller extends WP_Test_REST_Control
 		$this->assertCount( 1, $passwords );
 		$this->check_response( $response->get_data(), $passwords[0], true );
 		$this->assertEquals( 'App', $response->get_data()['name'] );
+		$this->assertEquals( $app_id, $response->get_data()['app_id'] );
 		$this->assertNull( $response->get_data()['last_used'] );
 		$this->assertNull( $response->get_data()['last_ip'] );
 	}
@@ -513,6 +520,36 @@ class WP_Test_REST_Application_Passwords_Controller extends WP_Test_REST_Control
 		$this->assertErrorResponse( 'rest_application_password_not_found', $response, 404 );
 	}
 
+	/**
+	 * @ticket 51583
+	 */
+	public function test_update_item_cannot_overwrite_app_id() {
+		wp_set_current_user( self::$admin );
+		list( , $item ) = WP_Application_Passwords::create_new_application_password( self::$admin, array( 'name' => 'App' ) );
+
+		$uuid    = $item['uuid'];
+		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me/application-passwords/' . $uuid );
+		$request->set_body_params( array( 'app_id' => wp_generate_uuid4() ) );
+		$response = rest_do_request( $request );
+		$this->assertEquals( '', $response->get_data()['app_id'] );
+
+		$app_id = wp_generate_uuid4();
+
+		list( , $item ) = WP_Application_Passwords::create_new_application_password(
+			self::$admin,
+			array(
+				'name'   => 'App',
+				'app_id' => $app_id,
+			)
+		);
+
+		$uuid    = $item['uuid'];
+		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me/application-passwords/' . $uuid );
+		$request->set_body_params( array( 'app_id' => wp_generate_uuid4() ) );
+		$response = rest_do_request( $request );
+		$this->assertEquals( $app_id, $response->get_data()['app_id'] );
+	}
+
 	/**
 	 * @ticket 42790
 	 */
@@ -775,12 +812,14 @@ class WP_Test_REST_Application_Passwords_Controller extends WP_Test_REST_Control
 	 */
 	protected function check_response( $response, $item, $password = false ) {
 		$this->assertArrayHasKey( 'uuid', $response );
+		$this->assertArrayHasKey( 'app_id', $response );
 		$this->assertArrayHasKey( 'name', $response );
 		$this->assertArrayHasKey( 'created', $response );
 		$this->assertArrayHasKey( 'last_used', $response );
 		$this->assertArrayHasKey( 'last_ip', $response );
 
 		$this->assertEquals( $item['uuid'], $response['uuid'] );
+		$this->assertEquals( $item['app_id'], $response['app_id'] );
 		$this->assertEquals( $item['name'], $response['name'] );
 		$this->assertEquals( gmdate( 'Y-m-d\TH:i:s', $item['created'] ), $response['created'] );
 
@@ -812,12 +851,13 @@ class WP_Test_REST_Application_Passwords_Controller extends WP_Test_REST_Control
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 
-		$this->assertCount( 6, $properties );
 		$this->assertArrayHasKey( 'uuid', $properties );
+		$this->assertArrayHasKey( 'app_id', $properties );
 		$this->assertArrayHasKey( 'name', $properties );
 		$this->assertArrayHasKey( 'password', $properties );
 		$this->assertArrayHasKey( 'created', $properties );
 		$this->assertArrayHasKey( 'last_used', $properties );
 		$this->assertArrayHasKey( 'last_ip', $properties );
+		$this->assertCount( 7, $properties );
 	}
 }
diff --git a/tests/qunit/fixtures/wp-api-generated.js b/tests/qunit/fixtures/wp-api-generated.js
index b6b5768f5c..619115e58b 100644
--- a/tests/qunit/fixtures/wp-api-generated.js
+++ b/tests/qunit/fixtures/wp-api-generated.js
@@ -4917,6 +4917,11 @@ mockedApiResponse.Schema = {
                         "POST"
                     ],
                     "args": {
+                        "app_id": {
+                            "description": "A machine-readable string provided by the application to uniquely identify it.",
+                            "type": "string",
+                            "required": false
+                        },
                         "name": {
                             "description": "The name of the application password.",
                             "type": "string",
@@ -4967,6 +4972,11 @@ mockedApiResponse.Schema = {
                         "PATCH"
                     ],
                     "args": {
+                        "app_id": {
+                            "description": "A machine-readable string provided by the application to uniquely identify it.",
+                            "type": "string",
+                            "required": false
+                        },
                         "name": {
                             "description": "The name of the application password.",
                             "type": "string",