Ács (or simply Acs, without diacritics) is a Hungarian-language occupational surname literally meaning "carpenter". Notable people with this surname include:
Gabor Acs (born 1926), Hungarian-born American architect
Ilona Ács (1920–1976), Hungarian swimmer and Olympics competitor
István Ács (1928–2018), Hungarian jurist and politician
Johanna Acs (born 1992), German model and beauty pageant winner
