Pa
pa or PA may stand for:
- pa, a word for dad or father ("pa" or "paw")
- Pa, Maori word meaning a fortified village or redoubt, described at length in Maori Wars
- Palestinian Authority
- Panama (ISO country code, PA)
- Panjabi language (ISO 639 alpha-2, pa)
- pascal (Pa), SI unit of pressure
- Passenger Announcement (PA)
- Pennsylvania, the US state
- Penny Arcade, the popular gaming webcomic
- Personal Assistant (PA)
- physician assistant, the medical profession
- Press Association,(PA) the UK news agency
- protactinium (Pa), symbol for the chemical element
- Port Angeles a city in Washington State in the United States
- Polyamide (PA), a kind of plastic
- Polyacetylene (PA)
- Power amplifier
- Public Address System system amplification equipment
- Phillips Academy, a private secondary school
- PA is the IATA alpha code designator for Pan American World Airways (Pan Am)
- PA is also the short form for the PA-RISC family processor architecture from Hewlett-Packard