OAP may refer to: OAP Tower, or Osaka Amenity Park Tower, a plaza and office development in Japan Old-age pensioner, a person who has retired, and now collects a pension One Australia policy, a proposal in the 1980s to limit Asian immigration to Australia Open access (publishing), a type of academic publication accessible by all, without subscription Offset Alpine Printing Off-axis parabolic reflector, a type of curved mirror used in optics and radio the Office of Atoms for Peace of Thailand