Cangxi County () is a county of northeastern Sichuan Province, China, located along the upper reaches of the Jialing River. It is under the administration of Guangyuan City. The population in 2020 was 512,617.
Cangxi produces red kiwifruit, a protected geographic origin product. It also produces rice, pomelo, and several pear varieties.
Cangxi administers 25 towns and 6 townships:
<nowiki>*</nowiki>county seat