Government, military, and politics •
Palestinian National Authority, also called Palestinian Authority, interim governing body of the Gaza Strip and part of the West Bank •
Pakistan Army •
Patriotic Alliance, a South African political party •
Patriotic Alternative, a British nationalist group •
People's Association, a Singaporean grassroots statutory board •
Philippine Army •
Patrulla Águila •
Planning Authority (Malta), a government agency of Malta •
Progressive Alliance, a political international of social-democratic, socialist and progressive political parties and organisations •
Prudential Authority, the South African government agency responsible for prudential regulation
Airlines •
Pan American World Airways, IATA airline designator PA (to 1991) •
Florida Coastal Airlines, IATA airline designator PA (1995–2010) •
Airblue, IATA airline designator PA (from 2003)
Other •
Pā, a traditional Maori settlement •
Professional association, a type of business organization •
PA Consulting Group •
PA Media, a news agency in the UK and Ireland, formerly the Press Association •
Produttori Associati, an Italian record label •
Peterson Academy, online education platform == Linguistics ==