P3A

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