- Allied Council for Japan
- allied kernels
- allied mean curvature
- allied series
- Allied Standard Avionics Architecture Council
- alligation
- Alligator Rivers
- alligator weed
- allilin
- all-in all-out production system of layers
- all-in/all-out system
- All India Radio，AIR
- All in Print China
- all-integer algorithm
- all integer algorithm for cutting plane
- all-integer programming
- Alliott Verdon Roe
- alliterated disyllables
- allitic property
- allium antimonide
- all-mains
- allmains
- all-male group
- Allman
- all-metal