Entertainment
- AC, the name of the ultimate computer at the end of time in Isaac Asimov's The Last Question
- A.C. Newman, solo stage-name for Canadian musician Carl Newman
- A.C. Slater, character in the American sitcom Saved by the Bell
- AC Comics, a comic book publisher established in 1969
- Adult contemporary music, a genre description used mainly in radio broadcasting
- After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing
- American Capitalist, the third studio album from American rock band 5FDP
- Anal Cunt, an American musical group
- Armor Class, a combat-related parameter in the Dungeons & Dragons role playing game system
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