Pa may stand for:

• Pennsylvania, postal code of the U.S. state.
• Pa, a word for dad or father ("pa" or "paw").
• Pa (Chinese), political title meaning hegemon.
• Pa (Māori), word meaning a fortified village or redoubt, described at length in Māori Wars.
• Pascal, SI unit of pressure.
• Petayear, an unit of time.
• Protactinium (Pa), symbol for the chemical element.
• Pa Department, Burkina Faso

PA may stand for:

• Florida Coastal Airlines, IATA airline designator.
• Purple Angelica
• PA-RISC family processor architecture from Hewlett-Packard.
• Palestinian Authority.
• Palo Alto, California.
• Pan American World Airways (Pan Am), IATA airline designator.
• Panama (ISO country code).
• Passenger announcement, not to be confused with Public Address System, below.
• Peano Arithmetic.
• Penny Arcade (comic), a popular gaming webcomic.
• People's Association, in Singapore.
• Performing artist.
• Personal assistant.
• Petampere or Peta-ampere, an SI unit of electric current (worth 10¹⁵ A).
• Phillips Academy, a private secondary school.
• Physician Assistant, the medical profession.
• Polyacetylene.
• Polyamide, a kind of plastic.
• Port Angeles a city in Washington, United States.
• Power amplifier.
• Press Association, an UK news agency.
• Prince Albert piercing
• Production Assistant.
• Public Address System, amplification equipment.
• Public administration
• Public affairs
• Public audio
• a series of paper sizes with 3:4 aspect ratio (most notably PA4)
• the Peano Axioms

pa may stand for:

• Per annum (also "p.a.").
• Panjabi language (ISO 639 alpha-2 language code).

pA may stand for:

• Picoampere, an SI unit of electric current (worth 10⁻¹² A).

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