Class C can mean either:

• Class C amplifier, a category of electronic amplifier
• Class C network, a type of Internet Protocol address
• Class C drugs, under the United Kingdom's Misuse of Drugs Act 1971 or under the Misuse of Drugs Acts of other Commonwealth Nations, which includes Cannabis, among others.
• An old explosives category (now known as 1.4G) for consumer fireworks
• Class C airspace as defined by the ICAO
• A type of driver's license
• In radio broadcasting in the United States, a class of AM or FM radio station; see the list of broadcast station classes.