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 -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