The Patent Office Professional Association (POPA) is a professional union of United States patent examiners. It was formed in 1964.^[1] "Professional Representation for Patent Professionals."

POPA represents all patent office professionals at the US Patent and Trademark Office including:

• Patent Attorneys at the Board of Patent Appeals and Interferences (BPAI)
• Non-supervisory attorneys and Congressional Affairs Specialists in the Office of External Affairs (OEA)
• Petitions attorneys in the Office of Petitions
• Review Quality Assurance Specialists (rQAS) in the Office of Patent Quality Assurance (OPQA)
• Designated Training Quality Assurance Specialists (tQAS)
• Non-supervisory patent examiners and primary examiners
• Non-supervisory Patent Reexamination Specialists in the Central Reexamination Unit (CRU)
• Patent Cooperation Treaty (PCT) examiners and attorney advisors
• Certain librarians and accountants