ACW may refer to:
Military American Civil War Air Control Wing, e.g.: 116th Air Control Wing 461st Air Control Wing 552d Air Control Wing
Other Acorn Cambridge Workstation, a microcomputer Ancient Christian Writers, a book series Anticlockwise Arts Council of Wales Ashfield–Colborne–Wawanosh, a municipality in Ontario, Canada Assault Championship Wrestling (2000-2004, 2008) Awesome Championship Wrestling (2024-Present) Hejazi Arabic, a language dialect (ISO 639-3 code ACW)