- XAC stands for XBRL (Extensible Business Reporting Language) Advisory Council Advisory Council
- XAC stands for Xian Aircraft Company (China)
- XAC stands for Xanthine Amine Congener
- XAC stands for Xenopus ADF (Actin Depolymerizing Factor)/Cofilin (biochemistry)
- XAC stands for Xinyang Agricultural College (China)
XAC