APT is an initialism. It may refer to:

Look up APT, apt, apt, or ap't in Wiktionary, the free dictionary.

• APT (programming language) (Automatically Programmed Tool), a high-level computer programming language
• APT (software), Debian's high-level package management system, also used by other Linux-based operating systems
• Almost Plain Text, or Doxia, a wiki-like syntax used mainly by Apache Maven
• Annotation processing tool, a utility for executing annotation processors in the Java programming language
• Advanced persistent threat, a set of stealthy and continuous computer hacking processes
• Applied Predictive Technologies, a statistical business analysis software company
• Advanced Programming Techniques Ltd., creators of the Command CICS software product

• Alabama Public Television, a network of PBS member stations in Alabama, U.S.A.
• American Players Theatre, a classical theater located in Spring Green, Wisconsin
• American Public Television, a television program provider in the United States
• APT Entertainment, a film production company in the Philippines

• Automated Payment Transaction tax, a proposal to replace all taxes with a single tax on each and every transaction in the economy
• Artist Pension Trust, an investment program designed for artists
• Arbitrage pricing theory, a general theory of asset pricing

• Ammonium paratungstate, a tungsten-based chemical compound
• Atom-probe tomography, an atomic-resolution microscopy technique
• Attached proton test, a technique used in carbon-13 nuclear magnetic resonance spectroscopy
• Automatic picture transmission, a weather satellite system
• Anterior pelvic tilt
• Acyl-protein thioesterase, an enzyme family that cleaves cysteine thioesters

• Advanced Passenger Train, a tilting passenger train designed and built during the late 1970s by British Rail
• Association for Public Transportation, a Boston-based nonprofit organization
• Australian Pacific Touring, an Australian tour operator

• American Perimeter Trail, a proposed trail system in the continental United States
• Animation photo transfer process (APT process), a process used in animation
• Applied Probability Trust, a UK-based non-profit-making foundation for study and research in the mathematical sciences
• APT assault rifle
• ASEAN Plus Three, the Association of Southeast Asian Nations plus China, South Korea, and Japan
• Asia-Pacific Telecommunity, an intergovernmental organisation concerning communications technology
• The Asia Pacific Triennial, a major art exhibition at the Gallery of Modern Art, Brisbane, Australia
• Asian Poker Tour, a major poker tour focusing on the Asia-Pacific region
• Association for Preservation Technology International
• Association for Psychological Therapies, a provider of accreditation and training for mental health professionals

• Apartment, sometimes abbreviated APT
• Apt (disambiguation)

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