diff --git a/projects/packages/forms/changelog/add-forms-backend-mailpoet-integration b/projects/packages/forms/changelog/add-forms-backend-mailpoet-integration
new file mode 100644
index 0000000000000..e45e4ef65578e
--- /dev/null
+++ b/projects/packages/forms/changelog/add-forms-backend-mailpoet-integration
@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Forms: Add MailPoet backend integration.
diff --git a/projects/packages/forms/src/contact-form/class-contact-form-plugin.php b/projects/packages/forms/src/contact-form/class-contact-form-plugin.php
index 4866247d41466..65f2842864875 100644
--- a/projects/packages/forms/src/contact-form/class-contact-form-plugin.php
+++ b/projects/packages/forms/src/contact-form/class-contact-form-plugin.php
@@ -11,6 +11,7 @@
 use Automattic\Jetpack\Constants;
 use Automattic\Jetpack\Extensions\Contact_Form\Contact_Form_Block;
 use Automattic\Jetpack\Forms\Jetpack_Forms;
+use Automattic\Jetpack\Forms\Service\MailPoet_Integration;
 use Automattic\Jetpack\Forms\Service\Post_To_Url;
 use Automattic\Jetpack\Status;
 use Automattic\Jetpack\Terms_Of_Service;
@@ -301,6 +302,16 @@ protected function __construct() {
 		}
 
 		self::register_contact_form_blocks();
+
+		// Register MailPoet integration hook after the class is loaded.
+		if ( Jetpack_Forms::is_mailpoet_enabled() ) {
+			add_action(
+				'grunion_after_feedback_post_inserted',
+				array( MailPoet_Integration::class, 'handle_mailpoet_integration' ),
+				15,
+				4
+			);
+		}
 	}
 
 	/**
@@ -1383,6 +1394,7 @@ public function process_form_submission() {
 		if ( ! empty( $form->attributes['salesforceData'] ) || ! empty( $form->attributes['postToUrl'] ) ) {
 			Post_To_Url::init();
 		}
+
 		// Process the form
 		return $form->process_submission();
 	}
diff --git a/projects/packages/forms/src/contact-form/class-contact-form.php b/projects/packages/forms/src/contact-form/class-contact-form.php
index 20666d36ab249..7fa63b9f275e3 100644
--- a/projects/packages/forms/src/contact-form/class-contact-form.php
+++ b/projects/packages/forms/src/contact-form/class-contact-form.php
@@ -179,6 +179,7 @@ public function __construct( $attributes, $content = null, $set_id = true ) {
 			'customThankyouMessage'  => __( 'Thank you for your submission!', 'jetpack-forms' ), // The message to show when customThankyou is set to 'message'.
 			'customThankyouRedirect' => '', // The URL to redirect to when customThankyou is set to 'redirect'.
 			'jetpackCRM'             => true, // Whether Jetpack CRM should store the form submission.
+			'connectMailPoet'        => false, // Whether to send contact to MailPoet.
 			'className'              => null,
 			'postToUrl'              => null,
 			'salesforceData'         => null,
diff --git a/projects/packages/forms/src/service/class-mailpoet-integration.php b/projects/packages/forms/src/service/class-mailpoet-integration.php
new file mode 100644
index 0000000000000..424a84fa8ebc1
--- /dev/null
+++ b/projects/packages/forms/src/service/class-mailpoet-integration.php
@@ -0,0 +1,178 @@
+<?php
+/**
+ * MailPoet Integration for Jetpack Contact Forms.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Forms\Service;
+
+/**
+ * Class MailPoet_Integration
+ *
+ * Handles integration with MailPoet for Jetpack Contact Forms.
+ */
+class MailPoet_Integration {
+	/**
+	 * MailPoet API instance
+	 *
+	 * @var mixed
+	 */
+	protected static $mailpoet_api = null;
+
+	/**
+	 * Get the MailPoet API instance (v1), instantiating if necessary.
+	 *
+	 * @return mixed
+	 */
+	protected static function get_api() {
+		if ( null === self::$mailpoet_api && class_exists( '\MailPoet\API\API' ) ) {
+			// @phan-suppress-next-line PhanUndeclaredClassMethod
+			self::$mailpoet_api = \MailPoet\API\API::MP( 'v1' );
+		}
+		return self::$mailpoet_api;
+	}
+
+	/**
+	 * Get or create a MailPoet list for Jetpack Forms.
+	 *
+	 * @param mixed       $mailpoet_api The MailPoet API instance.
+	 * @param string|null $list_name Optional. The name of the list to get or create. Defaults to 'Jetpack Form Subscribers'.
+	 * @return string|null List ID or null on failure.
+	 */
+	protected static function get_or_create_list_id( $mailpoet_api, $list_name = null ) {
+		$default_list_name        = 'Jetpack Form Subscribers';
+		$default_list_description = 'Subscribers from Jetpack Forms';
+		$list_name                = $list_name ? $list_name : $default_list_name;
+		$list_description         = $list_name === $default_list_name ? $default_list_description : $list_name;
+		try {
+			$lists = $mailpoet_api->getLists();
+			// Look for an existing list with the given name (not deleted)
+			foreach ( $lists as $list ) {
+				if ( $list['name'] === $list_name && empty( $list['deleted_at'] ) ) {
+					return $list['id'];
+				}
+			}
+			// Not found, create it
+			$new_list = $mailpoet_api->addList(
+				array(
+					'name'        => $list_name,
+					'description' => $list_description,
+				)
+			);
+			return $new_list['id'];
+		} catch ( \Exception $e ) {
+			return null;
+		}
+	}
+
+	/**
+	 * Add a subscriber to a MailPoet list.
+	 *
+	 * @param mixed  $mailpoet_api The MailPoet API instance.
+	 * @param string $list_id The MailPoet list ID.
+	 * @param array  $subscriber_data Associative array with at least 'email', optionally 'first_name', 'last_name'.
+	 * @return array|null Subscriber data on success, or null on failure.
+	 */
+	protected static function add_subscriber_to_list( $mailpoet_api, $list_id, $subscriber_data ) {
+		try {
+			$subscriber = $mailpoet_api->addSubscriber(
+				$subscriber_data,
+				array( $list_id )
+			);
+			return $subscriber;
+		} catch ( \Exception $e ) {
+			return null;
+		}
+	}
+
+	/**
+	 * Extract subscriber data (email, first_name, last_name) from form fields.
+	 *
+	 * @param array $fields Collection of Contact_Form_Field instances.
+	 * @return array Associative array with at least 'email', optionally 'first_name', 'last_name'. Empty array if no email found.
+	 */
+	protected static function get_subscriber_data_from_fields( $fields ) {
+		// Try and get the form from any of the fields
+		$form = null;
+		foreach ( $fields as $field ) {
+			if ( ! empty( $field->form ) ) {
+				$form = $field->form;
+				break;
+			}
+		}
+		if ( ! $form || ! is_a( $form, 'Automattic\Jetpack\Forms\ContactForm\Contact_Form' ) ) {
+			return array();
+		}
+
+		$subscriber_data = array();
+		foreach ( $form->fields as $field ) {
+			$id    = strtolower( str_replace( array( ' ', '_' ), '', $field->get_attribute( 'id' ) ) );
+			$label = strtolower( str_replace( array( ' ', '_' ), '', $field->get_attribute( 'label' ) ) );
+			$value = trim( $field->value );
+
+			if ( ( $id === 'email' || $label === 'email' ) && ! empty( $value ) ) {
+				$subscriber_data['email'] = $value;
+			} elseif ( ( $id === 'firstname' || $label === 'firstname' ) && ! empty( $value ) ) {
+				$subscriber_data['first_name'] = $value;
+			} elseif ( ( $id === 'lastname' || $label === 'lastname' ) && ! empty( $value ) ) {
+				$subscriber_data['last_name'] = $value;
+			}
+		}
+
+		if ( empty( $subscriber_data['email'] ) ) {
+			return array();
+		}
+
+		return $subscriber_data;
+	}
+
+	/**
+	 * Handle MailPoet integration after feedback post is inserted.
+	 *
+	 * @param int   $post_id      The post ID for the feedback CPT.
+	 * @param array $fields       Collection of Contact_Form_Field instances.
+	 * @param bool  $is_spam      Whether the submission is spam.
+	 */
+	public static function handle_mailpoet_integration( $post_id, $fields, $is_spam ) {
+		if ( $is_spam ) {
+			return;
+		}
+
+		// Try and get the form from any of the fields
+		$form = null;
+		foreach ( $fields as $field ) {
+			if ( ! empty( $field->form ) ) {
+				$form = $field->form;
+				break;
+			}
+		}
+		if ( ! $form || ! is_a( $form, 'Automattic\Jetpack\Forms\ContactForm\Contact_Form' ) ) {
+			return;
+		}
+
+		if ( empty( $form->attributes['connectMailPoet'] ) ) {
+			return;
+		}
+
+		$mailpoet_api = self::get_api();
+		if ( ! $mailpoet_api ) {
+			// MailPoet is not active or not loaded.
+			return;
+		}
+
+		$list_id = self::get_or_create_list_id( $mailpoet_api );
+		if ( ! $list_id ) {
+			// Could not get or create the list; bail out.
+			return;
+		}
+
+		$subscriber_data = self::get_subscriber_data_from_fields( $fields );
+		if ( empty( $subscriber_data ) ) {
+			// Email is required for MailPoet subscribers.
+			return;
+		}
+
+		self::add_subscriber_to_list( $mailpoet_api, $list_id, $subscriber_data );
+	}
+}
diff --git a/projects/packages/forms/tests/php/contact-form/Contact_Form_Test.php b/projects/packages/forms/tests/php/contact-form/Contact_Form_Test.php
index fe63c94439a10..e1e99a9653c64 100644
--- a/projects/packages/forms/tests/php/contact-form/Contact_Form_Test.php
+++ b/projects/packages/forms/tests/php/contact-form/Contact_Form_Test.php
@@ -2959,6 +2959,7 @@ public function test_get_instance_from_jwt_returns_with_all_attribute_data() {
 				'hiddenField2' => 'value2',
 			), // Hidden fields to include in the form.
 			'stepTransition'         => 'fade-slide',
+			'connectMailPoet'        => false,
 		);
 		// Add a widget ID to the attributes for testing.
 		$expected_attributes                        = $attributes;