Are S3 Access Points supported in GovCloud regions?

Yes, regular S3 Access Points are supported in AWS GovCloud (US) regions. However, there are some limitations and differences compared to standard AWS regions:

1. S3 Object Lambda Access Points are available in AWS GovCloud (US) regions, but only for SSL endpoints. They are not available for FIPS endpoints.

2. Bucket-style aliases for S3 Object Lambda Access Points are not supported in AWS GovCloud (US) regions.

3. Access points for S3 buckets were introduced to AWS GovCloud (US) regions, allowing customers to attach additional access points to both existing and new buckets.

It's important to note that while regular S3 Access Points are supported, some advanced features or newer S3 capabilities may have limitations or be unavailable in GovCloud regions. For example, Amazon S3 Express One Zone and Amazon S3 Tables are not available in AWS GovCloud (US) regions.

When working with S3 in GovCloud regions, it's always advisable to review the most current documentation or consult with AWS support for the most up-to-date information on feature availability and any specific limitations that may apply to your use case.
Sources
Amazon S3 in AWS GovCloud (US) - AWS GovCloud (US)
Document History - AWS GovCloud (US)