<note> <p>This action puts a bucket policy to an Amazon S3 on Outposts bucket. To put a policy on an S3 bucket, see <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketPolicy.html">PutBucketPolicy</a> in the <i>Amazon S3 API Reference</i>. </p> </note> <p>Applies an Amazon S3 bucket policy to an Outposts bucket. For more information, see <a href="https://docs.aws.amazon.com/AmazonS3/latest/userguide/S3onOutposts.html">Using Amazon S3 on Outposts</a> in the <i>Amazon S3 User Guide</i>.</p> <p>If you are using an identity other than the root user of the Amazon Web Services account that owns the Outposts bucket, the calling identity must have the <code>PutBucketPolicy</code> permissions on the specified Outposts bucket and belong to the bucket owner's account in order to use this action.</p> <p>If you don't have <code>PutBucketPolicy</code> permissions, Amazon S3 returns a <code>403 Access Denied</code> error. If you have the correct permissions, but you're not using an identity that belongs to the bucket owner's account, Amazon S3 returns a <code>405 Method Not Allowed</code> error.</p> <important> <p> As a security precaution, the root user of the Amazon Web Services account that owns a bucket can always use this action, even if the policy explicitly denies the root user the ability to perform this action. </p> </important> <p>For more information about bucket policies, see <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/using-iam-policies.html">Using Bucket Policies and User Policies</a>.</p> <p>All Amazon S3 on Outposts REST API requests for this action require an additional parameter of <code>x-amz-outpost-id</code> to be passed with the request. In addition, you must use an S3 on Outposts endpoint hostname prefix instead of <code>s3-control</code>. For an example of the request syntax for Amazon S3 on Outposts that uses the S3 on Outposts endpoint hostname prefix and the <code>x-amz-outpost-id</code> derived by using the access point ARN, see the <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_PutBucketPolicy.html#API_control_PutBucketPolicy_Examples">Examples</a> section.</p> <p>The following actions are related to <code>PutBucketPolicy</code>:</p> <ul> <li> <p> <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_GetBucketPolicy.html">GetBucketPolicy</a> </p> </li> <li> <p> <a href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_control_DeleteBucketPolicy.html">DeleteBucketPolicy</a> </p> </li> </ul>