Adenosine triphosphate, the universal energy currency of all known living organisms

All Tomorrow's Parties, a music festival.

AppleTalk Transaction Protocol

Automated theorem proving

Anti-Tachycardia Pacing (see Implantable cardioverter-defibrillator)

Association of Tennis Professionals, professional men's tennis association

Automatic Train Protection

BAe ATP, the British Aerospace ATP

Assistive Technology Practitioner

Advance Tasting Program, a wine subscription from Ridge Vineyards

Available-to-promise (ATP) is a business function that provides a response to customer order enquiries, based on resource availability.[1] It generates available quantities of the requested product, and delivery due dates. Therefore, ATP supports order...

Australian Technology Park

Flight Assignment: A.T.P., a MS-DOS game

Airline Transport Pilot License

Armenia Tree Project

Academic Talent Program

Authority to Proceed, usually issued by Governmental or Law enforcement organisations.

Association of Test Publishers

Alberta Theatre Projects, a major Canadian theatre company.

Associated Talking Pictures, a British film company which later became Ealing Studios

"All Tomorrow's Parties", a song by The Velvet Underground, released in 1967 on the album The Velvet Underground and Nico. The following are named after this song:

All Tomorrow's Parties, a novel in The Bridge trilogy by William Gibson

ATP Recordings, a record label affiliated with the above festival.

Allmänna tilläggspensionen, a supplementary (income-related) pension in Sweden.

Arbejdsmarkedets Tillægspension, a supplementary (income-related) pension in Denmark