diff --git a/packages/publisher/s3/src/Config.ts b/packages/publisher/s3/src/Config.ts
index 52abd50a30..ef3eae92c2 100644
--- a/packages/publisher/s3/src/Config.ts
+++ b/packages/publisher/s3/src/Config.ts
@@ -62,6 +62,38 @@ export interface PublisherS3Config {
    * Default: false
    */
   s3ForcePathStyle?: boolean;
+  /**
+   * Controls whether checksums are calculated for requests sent to S3.
+   *
+   * Possible values:
+   * - "WHEN_SUPPORTED" - Calculate checksums for all requests
+   * - "WHEN_REQUIRED" - Only calculate checksums when required by the service
+   *
+   * See:
+   * https://github.com/aws/aws-sdk-js-v3/blob/main/packages/middleware-flexible-checksums/src/constants.ts
+   *
+   * Default: "WHEN_SUPPORTED"
+   */
+  requestChecksumCalculation?:
+    | import('@aws-sdk/middleware-flexible-checksums').RequestChecksumCalculation
+    | import('@aws-sdk/types').Provider<import('@aws-sdk/middleware-flexible-checksums').RequestChecksumCalculation>
+    | undefined;
+  /**
+   * Controls whether checksums in responses from S3 are validated.
+   *
+   * Possible values:
+   * - "WHEN_SUPPORTED" - Validate checksums for all responses
+   * - "WHEN_REQUIRED" - Only validate checksums when provided by the service
+   *
+   * See:
+   * https://github.com/aws/aws-sdk-js-v3/blob/main/packages/middleware-flexible-checksums/src/constants.ts
+   *
+   * Default: "WHEN_SUPPORTED"
+   */
+  responseChecksumValidation?:
+    | import('@aws-sdk/middleware-flexible-checksums').ResponseChecksumValidation
+    | import('@aws-sdk/types').Provider<import('@aws-sdk/middleware-flexible-checksums').ResponseChecksumValidation>
+    | undefined;
   /**
    * Custom function to provide the key to upload a given file to
    */
diff --git a/packages/publisher/s3/src/PublisherS3.ts b/packages/publisher/s3/src/PublisherS3.ts
index d5994538ad..4d8849d7aa 100644
--- a/packages/publisher/s3/src/PublisherS3.ts
+++ b/packages/publisher/s3/src/PublisherS3.ts
@@ -48,6 +48,8 @@ export default class PublisherS3 extends PublisherStatic<PublisherS3Config> {
       region: this.config.region,
       endpoint: this.config.endpoint,
       forcePathStyle: !!this.config.s3ForcePathStyle,
+      requestChecksumCalculation: this.config.requestChecksumCalculation || ('WHEN_SUPPORTED' as const),
+      responseChecksumValidation: this.config.responseChecksumValidation || ('WHEN_SUPPORTED' as const),
     });
 
     d('creating s3 client with options:', this.config);