AIP

• Action International Pictures
• Afghan Islamic Press
• AIP Records, a record label
• American International Pictures, an independent film production/distribution company, now a subsidiary of MGM
• Art Institute of Pittsburgh
• Artistic Infusion Program, a program of the United States Mint, established in 2003

• Aeronautical Information Publication
• Airport Improvement Program

• Aryl hydrocarbon receptor interacting protein
• Acute intermittent porphyria
• Acute interstitial pneumonitis, Hamman-Rich syndrome
• Autoimmune pancreatitis

• American Institute of Parliamentarians
• American Institute of Philanthropy
• American Institute of Physics
• Australian Institute of Physics

• Alaskan Independence Party
• American Independent Party
• Azərbaycan İslam Partiyası, Azerbaijan Islamic Party

• Adaptive Internet Protocol, a protocol used by Sun Secure Global Desktop
• Agreement in principle, a stepping stone to a contract
• Air-independent propulsion, a technology used in submarines
• Air Injection Pump, a component of the air injection system of an engine
• American Industrial Partners. an American private equity partnership investing in industrial businesses
• Archival information package, a component of the Open Archival Information System model
• Arrow information paradox, whereby proprietary information loses market value once revealed
• Astrophysical Institute Potsdam

• Aluminium phosphide (AlP), with a lower-case L instead of an I

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