P3A may refer to:
- P3a, a component of brain activity
- Public-Private Partnership Authority (Pakistan), an organization by the Government of Pakistan
- Plasma membrane H+
-ATPase (P3A ATPase), an enzyme - Bowin P3a, a racing car
- P3A, a Canadian postcode assigned to Greater Sudbury
- P3A (Paphos Third Age), an affiliate of University of the Third Age
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