HAC
HAC stands for:
- High-availability cluster , high availability cluster
- Hill-start Assist Control, see Berganfahrhilfe
- Honorable Artillery Company , traditional British regiment
- Hearing aid compatibility of phones according to ANSI C63.19
- Hamburg-Altona Central Railway
- Hrvatske autoceste , the largest Croatian motorway operator
- Hughes Aircraft Company
- Hessischer Automobil-Club , local club of the ADAC
- Le Havre AC
- Homonnai Atlétikai Club , a Slovak football club
HAc stands for:
- Acetic acid (hydrogen acetate, HAc)
HaC stands for:
- Hallstatt C, a period of the Hallstatt period
hac stands for:
- Gorani (ISO-639-3 code), Northwest Iranian language
- Hawrami (ISO-639-3 code), dialect of the northwest Iranian Gorani language
