diff --git a/app/code/Magento/QuoteGraphQl/Model/Cart/QuoteAddressFactory.php b/app/code/Magento/QuoteGraphQl/Model/Cart/QuoteAddressFactory.php
index a66c0ddb1a536..afc88f026ed62 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Cart/QuoteAddressFactory.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Cart/QuoteAddressFactory.php
@@ -60,7 +60,11 @@ public function __construct(
      */
     public function createBasedOnInputData(array $addressInput): QuoteAddress
     {
-        $addressInput['country_id'] = $addressInput['country_code'] ?? '';
+        $addressInput['country_id'] = '';
+        if ($addressInput['country_code']) {
+            $addressInput['country_code'] = strtoupper($addressInput['country_code']);
+            $addressInput['country_id'] = $addressInput['country_code'];
+        }
 
         $maxAllowedLineCount = $this->addressHelper->getStreetLines();
         if (is_array($addressInput['street']) && count($addressInput['street']) > $maxAllowedLineCount) {
diff --git a/app/code/Magento/QuoteGraphQl/Model/Cart/SetShippingAddressesOnCart.php b/app/code/Magento/QuoteGraphQl/Model/Cart/SetShippingAddressesOnCart.php
index de1d93003ab12..77719bed5b16f 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Cart/SetShippingAddressesOnCart.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Cart/SetShippingAddressesOnCart.php
@@ -66,7 +66,6 @@ public function execute(ContextInterface $context, CartInterface $cart, array $s
         }
 
         if (null === $customerAddressId) {
-            $addressInput['country_code'] = strtoupper($addressInput['country_code']);
             $shippingAddress = $this->quoteAddressFactory->createBasedOnInputData($addressInput);
         } else {
             if (false === $context->getExtensionAttributes()->getIsCustomer()) {
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
index 9ff4d3bd0f605..011930e723273 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetBillingAddressOnCartTest.php
@@ -637,6 +637,65 @@ public function testSetNewBillingAddressWithRedundantStreetLine()
         $this->graphQlMutation($query, [], '', $this->getHeaderMap());
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testSetBillingAddressWithLowerCaseCountry()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+
+        $query = <<<QUERY
+mutation {
+  setBillingAddressOnCart(
+    input: {
+      cart_id: "$maskedQuoteId"
+      billing_address: {
+         address: {
+          firstname: "test firstname"
+          lastname: "test lastname"
+          company: "test company"
+          street: ["test street 1", "test street 2"]
+          city: "test city"
+          region: "test region"
+          postcode: "887766"
+          country_code: "us"
+          telephone: "88776655"
+          save_in_address_book: false
+         }
+      }
+    }
+  ) {
+    cart {
+      billing_address {
+        firstname
+        lastname
+        company
+        street
+        city
+        postcode
+        telephone
+        country {
+          code
+          label
+        }
+        __typename
+      }
+    }
+  }
+}
+QUERY;
+        $response = $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+
+        self::assertArrayHasKey('cart', $response['setBillingAddressOnCart']);
+        $cartResponse = $response['setBillingAddressOnCart']['cart'];
+        self::assertArrayHasKey('billing_address', $cartResponse);
+        $billingAddressResponse = $cartResponse['billing_address'];
+        $this->assertNewAddressFields($billingAddressResponse);
+    }
+
     /**
      * Verify the all the whitelisted fields for a New Address Object
      *
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
index 4afcfb2aef9db..730e65b4ba8aa 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/SetBillingAddressOnCartTest.php
@@ -455,6 +455,64 @@ public function testSetNewBillingAddressRedundantStreetLine()
         $this->graphQlMutation($query);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testSetBillingAddressWithLowerCaseCountry()
+    {
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+
+        $query = <<<QUERY
+mutation {
+  setBillingAddressOnCart(
+    input: {
+      cart_id: "$maskedQuoteId"
+      billing_address: {
+        address: {
+          firstname: "test firstname"
+          lastname: "test lastname"
+          company: "test company"
+          street: ["test street 1", "test street 2"]
+          city: "test city"
+          region: "test region"
+          postcode: "887766"
+          country_code: "us"
+          telephone: "88776655"
+          save_in_address_book: false
+        }
+      }
+    }
+  ) {
+    cart {
+      billing_address {
+        firstname
+        lastname
+        company
+        street
+        city
+        postcode
+        telephone
+        country {
+          code
+          label
+        }
+        __typename
+      }
+    }
+  }
+}
+QUERY;
+        $response = $this->graphQlMutation($query);
+
+        self::assertArrayHasKey('cart', $response['setBillingAddressOnCart']);
+        $cartResponse = $response['setBillingAddressOnCart']['cart'];
+        self::assertArrayHasKey('billing_address', $cartResponse);
+        $billingAddressResponse = $cartResponse['billing_address'];
+        $this->assertNewAddressFields($billingAddressResponse);
+    }
+
     /**
      * Verify the all the whitelisted fields for a New Address Object
      *