AHW may refer to:
- Atomic hydrogen welding, an arc welding process that uses an arc between two metal tungsten electrodes in a shielding atmosphere of hydrogen
- Aeromist-Kharkiv, an airline based in Kharkiv, Ukraine,
- Ahnapee and Western Railway, a common carrier short line railroad located in northeastern Wisconsin,
- Advanced Hypersonic Weapon, a DARPA project.
- Akkadisches Handwörterbuch (AHw), a German lexicon of the Akkadian language.