diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/GuestEmail.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/GuestEmail.php
new file mode 100644
index 0000000000000..76493c4cebe55
--- /dev/null
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/GuestEmail.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver;
+
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Quote\Model\Quote;
+use Magento\QuoteGraphQl\Model\Cart\GetCartForUser;
+
+/**
+ * @inheritdoc
+ */
+class GuestEmail implements ResolverInterface
+{
+    /**
+     * @var GetCartForUser
+     */
+    private $getCartForUser;
+
+    /**
+     * @param GetCartForUser $getCartForUser
+     */
+    public function __construct(
+        GetCartForUser $getCartForUser
+    ) {
+        $this->getCartForUser = $getCartForUser;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($value['model'])) {
+            throw new LocalizedException(__('"model" value should be specified'));
+        }
+        /** @var Quote $cart */
+        $cart = $value['model'];
+
+        return $cart->getCustomerEmail();
+    }
+}
diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php
new file mode 100644
index 0000000000000..29dc0e759242f
--- /dev/null
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/SetGuestEmailOnCart.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\QuoteGraphQl\Model\Resolver;
+
+use Magento\Framework\Exception\CouldNotSaveException;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\Framework\Validator\EmailAddress as EmailAddressValidator;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\QuoteGraphQl\Model\Cart\GetCartForUser;
+
+/**
+ * @inheritdoc
+ */
+class SetGuestEmailOnCart implements ResolverInterface
+{
+    /**
+     * @var CartRepositoryInterface
+     */
+    private $cartRepository;
+
+    /**
+     * @var GetCartForUser
+     */
+    private $getCartForUser;
+
+    /**
+     * @param GetCartForUser $getCartForUser
+     * @param CartRepositoryInterface $cartRepository
+     */
+    public function __construct(
+        GetCartForUser $getCartForUser,
+        CartRepositoryInterface $cartRepository
+    ) {
+        $this->getCartForUser = $getCartForUser;
+        $this->cartRepository = $cartRepository;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
+    {
+        if (!isset($args['input']['cart_id']) || empty($args['input']['cart_id'])) {
+            throw new GraphQlInputException(__('Required parameter "cart_id" is missing'));
+        }
+        $maskedCartId = $args['input']['cart_id'];
+
+        if (!isset($args['input']['email']) || empty($args['input']['email'])) {
+            throw new GraphQlInputException(__('Required parameter "email" is missing'));
+        }
+
+        $guestEmail = $args['input']['email'];
+
+        if (!\Zend_Validate::is($guestEmail, EmailAddressValidator::class)) {
+            throw new GraphQlInputException(__('Invalid email format'));
+        }
+
+        $currentUserId = $context->getUserId();
+
+        if ($currentUserId !== 0) {
+            throw new GraphQlInputException(__('The request is not allowed for logged in customers'));
+        }
+
+        $cart = $this->getCartForUser->execute($maskedCartId, $currentUserId);
+        $cart->setCustomerEmail($guestEmail);
+
+        try {
+            $this->cartRepository->save($cart);
+        } catch (CouldNotSaveException $e) {
+            throw new LocalizedException(__($e->getMessage()), $e);
+        }
+
+        return [
+            'cart' => [
+                'model' => $cart,
+                'guest_email' => $guestEmail
+            ],
+        ];
+    }
+}
diff --git a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
index 79cea3855f6f3..bf0d1cfb079cd 100644
--- a/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
+++ b/app/code/Magento/QuoteGraphQl/etc/schema.graphqls
@@ -17,6 +17,7 @@ type Mutation {
     setBillingAddressOnCart(input: SetBillingAddressOnCartInput): SetBillingAddressOnCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\SetBillingAddressOnCart")
     setShippingMethodsOnCart(input: SetShippingMethodsOnCartInput): SetShippingMethodsOnCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\SetShippingMethodsOnCart")
     setPaymentMethodOnCart(input: SetPaymentMethodOnCartInput): SetPaymentMethodOnCartOutput @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\SetPaymentMethodOnCart")
+    setGuestEmailOnCart(input: SetGuestEmailOnCartInput): SetGuestEmailOnCartOutput @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\SetGuestEmailOnCart")
 }
 
 input AddSimpleProductsToCartInput {
@@ -124,6 +125,11 @@ input PaymentMethodInput {
     purchase_order_number: String @doc(description:"Purchase order number")
 }
 
+input SetGuestEmailOnCartInput {
+    cart_id: String!
+    email: String!
+}
+
 type SetPaymentMethodOnCartOutput {
     cart: Cart!
 }
@@ -147,6 +153,7 @@ type ApplyCouponToCartOutput {
 type Cart {
     items: [CartItemInterface] @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\CartItems")
     applied_coupon: AppliedCoupon @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\AppliedCoupon")
+    guest_email: String @resolver (class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\GuestEmail")
     shipping_addresses: [CartAddress]! @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\ShippingAddresses")
     billing_address: CartAddress! @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\BillingAddress")
     available_payment_methods: [AvailablePaymentMethod]  @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\AvailablePaymentMethods") @doc(description: "Available payment methods")
@@ -249,6 +256,10 @@ type RemoveItemFromCartOutput {
     cart: Cart!
 }
 
+type SetGuestEmailOnCartOutput {
+    cart: Cart!
+}
+
 type SimpleCartItem implements CartItemInterface @doc(description: "Simple Cart Item") {
     customizable_options: [SelectedCustomizableOption] @resolver(class: "Magento\\QuoteGraphQl\\Model\\Resolver\\CustomizableOptions")
 }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php
new file mode 100644
index 0000000000000..4dca82118c1ef
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetGuestEmailOnCartTest.php
@@ -0,0 +1,85 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Customer;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\Integration\Api\CustomerTokenServiceInterface;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for setGuestEmailOnCart mutation
+ */
+class SetGuestEmailOnCartTest extends GraphQlAbstract
+{
+    /**
+     * @var CustomerTokenServiceInterface
+     */
+    private $customerTokenService;
+
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+        $this->customerTokenService = $objectManager->get(CustomerTokenServiceInterface::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_address_saved.php
+     */
+    public function testSetGuestEmailOnCartForLoggedInCustomer()
+    {
+        $reservedOrderId = 'test_order_1';
+        $email = 'some@user.com';
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute($reservedOrderId);
+
+        $query = $this->getSetGuestEmailOnCartMutation($maskedQuoteId, $email);
+        $this->expectExceptionMessage('The request is not allowed for logged in customers');
+        $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * Returns GraphQl mutation query for setting email address for a guest
+     *
+     * @param string $maskedQuoteId
+     * @param string $email
+     * @return string
+     */
+    private function getSetGuestEmailOnCartMutation(string $maskedQuoteId, string $email): string
+    {
+        return <<<QUERY
+mutation {
+  setGuestEmailOnCart(input: {
+    cart_id:"$maskedQuoteId"
+    email: "$email"
+  }) {
+    cart {
+      guest_email
+    }
+  }
+}
+QUERY;
+    }
+
+    /**
+     * @param string $username
+     * @param string $password
+     * @return array
+     */
+    private function getHeaderMap(string $username = 'customer@example.com', string $password = 'password'): array
+    {
+        $customerToken = $this->customerTokenService->createCustomerAccessToken($username, $password);
+        $headerMap = ['Authorization' => 'Bearer ' . $customerToken];
+        return $headerMap;
+    }
+}
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CartGuestEmailTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CartGuestEmailTest.php
new file mode 100644
index 0000000000000..751029e6b87a3
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CartGuestEmailTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Guest;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for getting guest email from cart
+ */
+class CartGuestEmailTest extends GraphQlAbstract
+{
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_virtual_product_saved.php
+     */
+    public function testGetCartGuestEmail()
+    {
+        $email = 'store@example.com';
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute(
+            'test_order_with_virtual_product_without_address'
+        );
+
+        $query = <<<QUERY
+{
+  cart(cart_id:"$maskedQuoteId") {    
+    guest_email
+  }
+}
+QUERY;
+
+        $response = $this->graphQlQuery($query);
+        $this->assertArrayHasKey('cart', $response);
+        $this->assertEquals($email, $response['cart']['guest_email']);
+    }
+}
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php
new file mode 100644
index 0000000000000..f95679b2eb5e1
--- /dev/null
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetGuestEmailOnCartTest.php
@@ -0,0 +1,101 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Guest;
+
+use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for setGuestEmailOnCart mutation
+ */
+class SetGuestEmailOnCartTest extends GraphQlAbstract
+{
+    /**
+     * @var GetMaskedQuoteIdByReservedOrderId
+     */
+    private $getMaskedQuoteIdByReservedOrderId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->getMaskedQuoteIdByReservedOrderId = $objectManager->get(GetMaskedQuoteIdByReservedOrderId::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Quote/_files/empty_quote.php
+     */
+    public function testSetGuestEmailOnCart()
+    {
+        $reservedOrderId = 'reserved_order_id';
+        $email = 'some@user.com';
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute($reservedOrderId);
+
+        $query = $this->getSetGuestEmailOnCartMutation($maskedQuoteId, $email);
+        $response = $this->graphQlQuery($query);
+
+        $this->assertArrayHasKey('setGuestEmailOnCart', $response);
+        $this->assertArrayHasKey('cart', $response['setGuestEmailOnCart']);
+        $this->assertEquals($email, $response['setGuestEmailOnCart']['cart']['guest_email']);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Quote/_files/empty_quote.php
+     * @dataProvider incorrectInputDataProvider
+     * @param string|null $maskedQuoteId
+     * @param string $email
+     * @param string $exceptionMessage
+     */
+    public function testSetGuestEmailOnCartWithIncorrectInputData(
+        ?string $maskedQuoteId,
+        string $email,
+        string $exceptionMessage
+    ) {
+        if (null === $maskedQuoteId) { // Generate ID in case if no provided by data provider
+            $reservedOrderId = 'reserved_order_id';
+            $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute($reservedOrderId);
+        }
+
+        $query = $this->getSetGuestEmailOnCartMutation($maskedQuoteId, $email);
+        $this->expectExceptionMessage($exceptionMessage);
+        $this->graphQlQuery($query);
+    }
+
+    public function incorrectInputDataProvider(): array
+    {
+        return [
+            'wrong_email' => [null, 'some', 'Invalid email format'],
+            'no_email' => [null, '', 'Required parameter "email" is missing'],
+            'wrong_quote_id' =>  ['xxx', 'some@user.com', 'Could not find a cart with ID "xxx"'],
+            'no_quote_id' =>  ['', 'some@user.com', 'Required parameter "cart_id" is missing']
+        ];
+    }
+
+    /**
+     * Returns GraphQl mutation query for setting email address for a guest
+     *
+     * @param string $maskedQuoteId
+     * @param string $email
+     * @return string
+     */
+    private function getSetGuestEmailOnCartMutation(string $maskedQuoteId, string $email): string
+    {
+        return <<<QUERY
+mutation {
+  setGuestEmailOnCart(input: {
+    cart_id:"$maskedQuoteId"
+    email: "$email"
+  }) {
+    cart {
+      guest_email
+    }
+  }
+}
+QUERY;
+    }
+}
diff --git a/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php b/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
index 835b2ab812856..833e5a57ac34f 100644
--- a/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
+++ b/dev/tests/integration/testsuite/Magento/Checkout/_files/quote_with_virtual_product_saved.php
@@ -13,6 +13,7 @@
     ->setIsMultiShipping(false)
     ->setReservedOrderId('test_order_with_virtual_product_without_address')
     ->setEmail('store@example.com')
+    ->setCustomerEmail('store@example.com')
     ->addProduct(
         $product->load($product->getId()),
         1