ABL
- A Beautiful Lie
- A Block diagram Language
- A Bug's Life
- A Bug's Life (video game)
- AB1 (disambiguation)
- ABI (disambiguation)
- ABL (gene)
- ABL Space Systems
- AL-Bank Ligaen
- ASEAN Basketball League
- Abetalipoproteinemia
- Academia Brasileira de Letras
- Activity-based learning
- Advanced Business Language
- African Basketball League
- Air Busan
- Airborne Laser
- Alameda Belt Line
- Alaska Baseball League
- Allegany Ballistics Laboratory
- Allied Bank Limited
- Ambler Airport
- American Basketball League (1925–1955)
- American Basketball League (1961–1962)
- American Basketball League (1996–1998)
- American Basketball League (2013–2015)
- Armored Box Launcher
- Asset-based lending
- Atmospheric boundary layer
- Australian Baseball League
- Australian Baseball League (1989–1999)
- Australian bat lyssavirus
- Lampung Nyo language
- NSW Business Chamber
- OpenEdge Advanced Business Language