FDA registration application forms can be obtained from the official website of the U.S. Food and Drug Administration (FDA). These forms, including those for 510(k) premarket notifications, Premarket Approval (PMA), De Novo classification requests, and establishment registration, are available for download and submission electronically through the FDA's electronic submission gateway (ESG) or other specified channels. Manufacturers and applicants can access these forms, along with guidance documents and instructions for completing submissions, on the FDA's dedicated webpages for medical devices and regulatory submissions.