PAA may refer to:
- Piezo Audio Amplifier
- Pan American Airlines, commonly known as Pan Am
- Pan American Association of Anatomy
- Penny Arcade Adventures
- Peroxyacetic acid, a chemical
- Perpetuities and Accumulations Act 1964
- Perpetuities and Accumulations Act 2009
- Personal Attack Alarm
- Phosphoamino acid analysis, a biochemistry technique
- Polyacrylamide, an acrylate polymer
- Population Association of America
- Port of the Americas Authority
- Portland Adventist Academy, an Adventist High School
- Primary Aromatic Amine, a group of compounds
- Protect America Act of 2007
- Proto-Afro-Asiatic, a language
- Paa (film), a Hindi film released on December 4
- Paa, genus of true frogs
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