BuyAmerican.gov Act of 2021 This bill establishes requirements related to federal agencies granting waivers to Buy American laws (generally, laws that require or encourage the purchase of domestic goods in federal contracts and other activities) and addresses related issues. For example, before granting such a waiver, the agency must, with some exceptions, submit a request with certain information about the waiver to the General Services Administration, which shall make the request available for public comment for at least 15 days.