Aap or AAP may refer to:

• Apollo Applications Program, NASA's vision for long-range space exploration based on technologies developed for Project Apollo

• Aappilattoq Heliport (Avannaata) in Aappilattoq, Greenland
• Agrupación Aérea Presidencial, the Argentine president's personal air fleet
• Aircraft Acceptance Point, a term used by the Royal Flying Corps to designate Lympne Aerodrome (later RAF Lympne)
• Airport Armed Police in Bangladesh
• Andrau Airpark, a former airport in Houston, Texas, United States
• IATA airport code for Aji Pangeran Tumenggung Pranoto International Airport in Samarinda, East Kalimantan Province, Indonesia

• Accredited ACH Professional, an Electronic Payments Professional
• Advance Auto Parts, an American vehicle parts retailer
• Associated Artists Productions, a film distributor
• Association of American Publishers, a United States trade association

• Ap (water), a Sanskrit word
• Pará Arára language, a Cariban language of Brazil

• ArtAsiaPacific, a contemporary art and culture magazine
• Australian Associated Press, Australia's national news agency

• Alanine aminopeptidase, a medical biomarker enzyme
• Atypical antipsychotic, a group of antipsychotic drugs
• American Academy of Pediatrics, an American and Canadian professional medical fellowship
• American Academy of Periodontology, a professional organization for periodontists
• Association of Academic Physiatrists, an organization to support the advancement of physical medicine and rehabilitation
• Association of American Physicians, a medical honor society

• Association of Australasian Palaeontologists
• Australasian Association of Philosophy
• Automobile Association Philippines, a member of the Fédération Internationale de l'Automobile

• Alexandra Palace railway station in London, UK
• Ann Arbor Pioneer High School, a high school in Michigan, United States
• Cornell University College of Architecture, Art, and Planning, New York, United States

• Aam Aadmi Party, a political party in India

• A-A-P, a computer software build and installation utility
• Advanced Active Partition, a special type of active partition in a MBR

• Argumentum ad populum, a logical fallacy
• Aerobic anoxygenic phototroph, a metabolic classification of bacteria

• All pages with titles containing aap
• AAPS (disambiguation)
• 2AP (disambiguation)
• AP (disambiguation)
• APP (disambiguation)
• APA (disambiguation)
• PAA (disambiguation)