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