diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ce5ca3..a966096 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT RELEASED
 
+### Added
+
+- Add AddPermission endpoint
+
 ### Changed
 
 - Enable compiler optimization for the `sprintf` function.
diff --git a/composer.json b/composer.json
index 871fafc..6ae2ad1 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.1-dev"
+            "dev-master": "2.2-dev"
         }
     }
 }
diff --git a/src/Input/AddPermissionRequest.php b/src/Input/AddPermissionRequest.php
new file mode 100644
index 0000000..66dea9b
--- /dev/null
+++ b/src/Input/AddPermissionRequest.php
@@ -0,0 +1,218 @@
+<?php
+
+namespace AsyncAws\Sqs\Input;
+
+use AsyncAws\Core\Exception\InvalidArgument;
+use AsyncAws\Core\Input;
+use AsyncAws\Core\Request;
+use AsyncAws\Core\Stream\StreamFactory;
+
+final class AddPermissionRequest extends Input
+{
+    /**
+     * The URL of the Amazon SQS queue to which permissions are added.
+     *
+     * Queue URLs and names are case-sensitive.
+     *
+     * @required
+     *
+     * @var string|null
+     */
+    private $queueUrl;
+
+    /**
+     * The unique identification of the permission you're setting (for example, `AliceSendMessage`). Maximum 80 characters.
+     * Allowed characters include alphanumeric characters, hyphens (`-`), and underscores (`_`).
+     *
+     * @required
+     *
+     * @var string|null
+     */
+    private $label;
+
+    /**
+     * The Amazon Web Services account numbers of the principals [^1] who are to receive permission. For information about
+     * locating the Amazon Web Services account identification, see Your Amazon Web Services Identifiers [^2] in the *Amazon
+     * SQS Developer Guide*.
+     *
+     * [^1]: https://docs.aws.amazon.com/general/latest/gr/glos-chap.html#P
+     * [^2]: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-making-api-requests.html#sqs-api-request-authentication
+     *
+     * @required
+     *
+     * @var string[]|null
+     */
+    private $awsAccountIds;
+
+    /**
+     * The action the client wants to allow for the specified principal. Valid values: the name of any action or `*`.
+     *
+     * For more information about these actions, see Overview of Managing Access Permissions to Your Amazon Simple Queue
+     * Service Resource [^1] in the *Amazon SQS Developer Guide*.
+     *
+     * Specifying `SendMessage`, `DeleteMessage`, or `ChangeMessageVisibility` for `ActionName.n` also grants permissions
+     * for the corresponding batch versions of those actions: `SendMessageBatch`, `DeleteMessageBatch`, and
+     * `ChangeMessageVisibilityBatch`.
+     *
+     * [^1]: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-overview-of-managing-access.html
+     *
+     * @required
+     *
+     * @var string[]|null
+     */
+    private $actions;
+
+    /**
+     * @param array{
+     *   QueueUrl?: string,
+     *   Label?: string,
+     *   AWSAccountIds?: string[],
+     *   Actions?: string[],
+     *   '@region'?: string|null,
+     * } $input
+     */
+    public function __construct(array $input = [])
+    {
+        $this->queueUrl = $input['QueueUrl'] ?? null;
+        $this->label = $input['Label'] ?? null;
+        $this->awsAccountIds = $input['AWSAccountIds'] ?? null;
+        $this->actions = $input['Actions'] ?? null;
+        parent::__construct($input);
+    }
+
+    /**
+     * @param array{
+     *   QueueUrl?: string,
+     *   Label?: string,
+     *   AWSAccountIds?: string[],
+     *   Actions?: string[],
+     *   '@region'?: string|null,
+     * }|AddPermissionRequest $input
+     */
+    public static function create($input): self
+    {
+        return $input instanceof self ? $input : new self($input);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getActions(): array
+    {
+        return $this->actions ?? [];
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getAwsAccountIds(): array
+    {
+        return $this->awsAccountIds ?? [];
+    }
+
+    public function getLabel(): ?string
+    {
+        return $this->label;
+    }
+
+    public function getQueueUrl(): ?string
+    {
+        return $this->queueUrl;
+    }
+
+    /**
+     * @internal
+     */
+    public function request(): Request
+    {
+        // Prepare headers
+        $headers = [
+            'Content-Type' => 'application/x-amz-json-1.0',
+            'X-Amz-Target' => 'AmazonSQS.AddPermission',
+            'Accept' => 'application/json',
+        ];
+
+        // Prepare query
+        $query = [];
+
+        // Prepare URI
+        $uriString = '/';
+
+        // Prepare Body
+        $bodyPayload = $this->requestBody();
+        $body = empty($bodyPayload) ? '{}' : json_encode($bodyPayload, 4194304);
+
+        // Return the Request
+        return new Request('POST', $uriString, $query, $headers, StreamFactory::create($body));
+    }
+
+    /**
+     * @param string[] $value
+     */
+    public function setActions(array $value): self
+    {
+        $this->actions = $value;
+
+        return $this;
+    }
+
+    /**
+     * @param string[] $value
+     */
+    public function setAwsAccountIds(array $value): self
+    {
+        $this->awsAccountIds = $value;
+
+        return $this;
+    }
+
+    public function setLabel(?string $value): self
+    {
+        $this->label = $value;
+
+        return $this;
+    }
+
+    public function setQueueUrl(?string $value): self
+    {
+        $this->queueUrl = $value;
+
+        return $this;
+    }
+
+    private function requestBody(): array
+    {
+        $payload = [];
+        if (null === $v = $this->queueUrl) {
+            throw new InvalidArgument(\sprintf('Missing parameter "QueueUrl" for "%s". The value cannot be null.', __CLASS__));
+        }
+        $payload['QueueUrl'] = $v;
+        if (null === $v = $this->label) {
+            throw new InvalidArgument(\sprintf('Missing parameter "Label" for "%s". The value cannot be null.', __CLASS__));
+        }
+        $payload['Label'] = $v;
+        if (null === $v = $this->awsAccountIds) {
+            throw new InvalidArgument(\sprintf('Missing parameter "AWSAccountIds" for "%s". The value cannot be null.', __CLASS__));
+        }
+
+        $index = -1;
+        $payload['AWSAccountIds'] = [];
+        foreach ($v as $listValue) {
+            ++$index;
+            $payload['AWSAccountIds'][$index] = $listValue;
+        }
+
+        if (null === $v = $this->actions) {
+            throw new InvalidArgument(\sprintf('Missing parameter "Actions" for "%s". The value cannot be null.', __CLASS__));
+        }
+
+        $index = -1;
+        $payload['Actions'] = [];
+        foreach ($v as $listValue) {
+            ++$index;
+            $payload['Actions'][$index] = $listValue;
+        }
+
+        return $payload;
+    }
+}
diff --git a/src/SqsClient.php b/src/SqsClient.php
index 2d93069..aa839f6 100644
--- a/src/SqsClient.php
+++ b/src/SqsClient.php
@@ -38,6 +38,7 @@
 use AsyncAws\Sqs\Exception\RequestThrottledException;
 use AsyncAws\Sqs\Exception\TooManyEntriesInBatchRequestException;
 use AsyncAws\Sqs\Exception\UnsupportedOperationException;
+use AsyncAws\Sqs\Input\AddPermissionRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityBatchRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityRequest;
 use AsyncAws\Sqs\Input\CreateQueueRequest;
@@ -69,6 +70,63 @@
 
 class SqsClient extends AbstractApi
 {
+    /**
+     * Adds a permission to a queue for a specific principal [^1]. This allows sharing access to the queue.
+     *
+     * When you create a queue, you have full control access rights for the queue. Only you, the owner of the queue, can
+     * grant or deny permissions to the queue. For more information about these permissions, see Allow Developers to Write
+     * Messages to a Shared Queue [^2] in the *Amazon SQS Developer Guide*.
+     *
+     * > - `AddPermission` generates a policy for you. You can use `SetQueueAttributes` to upload your policy. For more
+     * >   information, see Using Custom Policies with the Amazon SQS Access Policy Language [^3] in the *Amazon SQS
+     * >   Developer Guide*.
+     * > - An Amazon SQS policy can have a maximum of seven actions per statement.
+     * > - To remove the ability to change queue permissions, you must deny permission to the `AddPermission`,
+     * >   `RemovePermission`, and `SetQueueAttributes` actions in your IAM policy.
+     * > - Amazon SQS `AddPermission` does not support adding a non-account principal.
+     * >
+     *
+     * > Cross-account permissions don't apply to this action. For more information, see Grant cross-account permissions to
+     * > a role and a username [^4] in the *Amazon SQS Developer Guide*.
+     *
+     * [^1]: https://docs.aws.amazon.com/general/latest/gr/glos-chap.html#P
+     * [^2]: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-writing-an-sqs-policy.html#write-messages-to-shared-queue
+     * [^3]: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-creating-custom-policies.html
+     * [^4]: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-customer-managed-policy-examples.html#grant-cross-account-permissions-to-role-and-user-name
+     *
+     * @see https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_AddPermission.html
+     * @see https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sqs-2012-11-05.html#addpermission
+     *
+     * @param array{
+     *   QueueUrl: string,
+     *   Label: string,
+     *   AWSAccountIds: string[],
+     *   Actions: string[],
+     *   '@region'?: string|null,
+     * }|AddPermissionRequest $input
+     *
+     * @throws OverLimitException
+     * @throws RequestThrottledException
+     * @throws QueueDoesNotExistException
+     * @throws InvalidAddressException
+     * @throws InvalidSecurityException
+     * @throws UnsupportedOperationException
+     */
+    public function addPermission($input): Result
+    {
+        $input = AddPermissionRequest::create($input);
+        $response = $this->getResponse($input->request(), new RequestContext(['operation' => 'AddPermission', 'region' => $input->getRegion(), 'exceptionMapping' => [
+            'OverLimit' => OverLimitException::class,
+            'RequestThrottled' => RequestThrottledException::class,
+            'QueueDoesNotExist' => QueueDoesNotExistException::class,
+            'InvalidAddress' => InvalidAddressException::class,
+            'InvalidSecurity' => InvalidSecurityException::class,
+            'UnsupportedOperation' => UnsupportedOperationException::class,
+        ]]));
+
+        return new Result($response);
+    }
+
     /**
      * Changes the visibility timeout of a specified message in a queue to a new value. The default visibility timeout for a
      * message is 30 seconds. The minimum is 0 seconds. The maximum is 12 hours. For more information, see Visibility
diff --git a/tests/Integration/SqsClientTest.php b/tests/Integration/SqsClientTest.php
index bbdb0f9..0857a46 100644
--- a/tests/Integration/SqsClientTest.php
+++ b/tests/Integration/SqsClientTest.php
@@ -5,6 +5,7 @@
 use AsyncAws\Core\Credentials\NullProvider;
 use AsyncAws\Core\Test\TestCase;
 use AsyncAws\Sqs\Enum\QueueAttributeName;
+use AsyncAws\Sqs\Input\AddPermissionRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityBatchRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityRequest;
 use AsyncAws\Sqs\Input\CreateQueueRequest;
@@ -25,6 +26,21 @@
 
 class SqsClientTest extends TestCase
 {
+    public function testAddPermission(): void
+    {
+        $client = $this->getClient();
+
+        $input = new AddPermissionRequest([
+            'QueueUrl' => 'change me',
+            'Label' => 'change me',
+            'AWSAccountIds' => ['change me'],
+            'Actions' => ['change me'],
+        ]);
+        $result = $client->addPermission($input);
+
+        $result->resolve();
+    }
+
     public function testChangeMessageVisibility()
     {
         $sqs = $this->getClient();
diff --git a/tests/Unit/Input/AddPermissionRequestTest.php b/tests/Unit/Input/AddPermissionRequestTest.php
new file mode 100644
index 0000000..3f7f842
--- /dev/null
+++ b/tests/Unit/Input/AddPermissionRequestTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace AsyncAws\Sqs\Tests\Unit\Input;
+
+use AsyncAws\Core\Test\TestCase;
+use AsyncAws\Sqs\Input\AddPermissionRequest;
+
+class AddPermissionRequestTest extends TestCase
+{
+    public function testRequest(): void
+    {
+        $input = new AddPermissionRequest([
+            'QueueUrl' => 'https://sqs.us-east-1.amazonaws.com/177715257436/MyQueue/',
+            'Label' => 'MyLabel',
+            'AWSAccountIds' => ['177715257436', '111111111111'],
+            'Actions' => ['SendMessage', 'ReceiveMessage'],
+        ]);
+
+        // see https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_AddPermission.html
+        $expected = '
+            POST / HTTP/1.0
+            Content-Type: application/x-amz-json-1.0
+            x-amz-target: AmazonSQS.AddPermission
+            Accept: application/json
+
+            {
+                "QueueUrl": "https://sqs.us-east-1.amazonaws.com/177715257436/MyQueue/",
+                "Label": "MyLabel",
+                "Actions": ["SendMessage", "ReceiveMessage"],
+                "AWSAccountIds": ["177715257436", "111111111111"]
+            }';
+
+        self::assertRequestEqualsHttpRequest($expected, $input->request());
+    }
+}
diff --git a/tests/Unit/SqsClientTest.php b/tests/Unit/SqsClientTest.php
index 475fae9..d16c93d 100644
--- a/tests/Unit/SqsClientTest.php
+++ b/tests/Unit/SqsClientTest.php
@@ -5,6 +5,7 @@
 use AsyncAws\Core\Credentials\NullProvider;
 use AsyncAws\Core\Result;
 use AsyncAws\Core\Test\TestCase;
+use AsyncAws\Sqs\Input\AddPermissionRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityBatchRequest;
 use AsyncAws\Sqs\Input\ChangeMessageVisibilityRequest;
 use AsyncAws\Sqs\Input\CreateQueueRequest;
@@ -35,6 +36,22 @@
 
 class SqsClientTest extends TestCase
 {
+    public function testAddPermission(): void
+    {
+        $client = new SqsClient([], new NullProvider(), new MockHttpClient());
+
+        $input = new AddPermissionRequest([
+            'QueueUrl' => 'change me',
+            'Label' => 'change me',
+            'AWSAccountIds' => ['change me'],
+            'Actions' => ['change me'],
+        ]);
+        $result = $client->addPermission($input);
+
+        self::assertInstanceOf(Result::class, $result);
+        self::assertFalse($result->info()['resolved']);
+    }
+
     public function testChangeMessageVisibility(): void
     {
         $client = new SqsClient([], new NullProvider(), new MockHttpClient());