Apt
- APT (programming language)
- APT (software)
- APT Entertainment
- APT assault rifle
- APT. (song)
- ASEAN Plus Three
- Acyl-protein thioesterase
- Advanced Passenger Train
- Advanced persistent threat
- Aforementioned Productions
- Alabama Public Television
- Almost Plain Text
- American Perimeter Trail
- American Players Theatre
- American Public Television
- Ammonium paratungstate
- Animation photo transfer process
- Annotation processing tool
- Apartment (disambiguation)
- Applied Predictive Technologies
- Applied Probability Trust
- Apt (Egyptian)
- Apt (Martian crater)
- Apt Cathedral
- Apt Records
- Apt test
- Apt, Vaucluse
- Apt. (film)
- Arbitrage pricing theory
- Arrondissement of Apt
- Artist Pension Trust
- Asia-Pacific Telecommunity
- Asian Poker Tour
- Association for Preservation Technology International
- Association for Psychological Therapies
- Association for Public Transportation
- Atom-probe tomography
- Australian Pacific Touring
- Automated Payment Transaction tax
- Automatic picture transmission
- Canton of Apt
- Carbon-13 NMR
- Command CICS
- Gallery of Modern Art, Brisbane
- Jerome Apt
- Leonard Apt
- Milburn G. Apt
- Nicole (Chilean singer)
- Provence-Alpes-Côte d'Azur