Class A or A Class can refer to:
- Class A, the second book in the CHERUB series by Robert MUchamore.
- Class A war criminal - see war crime.
- One of the lower levels of minor league baseball in the U.S.
- Class A amplifier, a category of electronic amplifier
- Classful network (or Class A network), a type of IP address
- Class A drug, one with the highest criminal penalties in the UK
- Class A surfaces in automotive design
- An old explosives category for high explosives like dynamite
- An airspace class as defined by the ICAO
- A type of driver's license
- A type of cigarette
- A type of fire fighting foam
- Class A office space
- Class A stock
- Class A television service
- A type of broadcast station (see list of broadcast station classes)
- Class A uniform, a type of military dress uniform
- Class A stars
- Mercedes-Benz A-Class, a small familiy car by Mercedes-Benz
