Cas may refer to:
* Caș, a type of cheese made in Romania
* ' (1886–) Czech magazine associated with Tomáš Garrigue Masaryk
* ''Čas'' (19 April 1945–February 1948), the official, daily newspaper of the Democratic Party (Slovakia, 1944), Democratic Party of Slovakia
* ''CAS'', a 2018 album by Lúnasa (band), Lúnasa, an Irish Celtic band
* Cas (people), an ancient people near the Caspian Sea
* Cas (name), a list of people (and a mythological hero) with the given name, nickname or surname
* Cas guava (''Psidium friedrichsthalianum''), a Costa Rican guava species
* Cas Cay, an island in St. Thomas, United States Virgin Islands
* Cassiopeia (constellation), standard astronomical abbreviation
* Cas9, a CRISPR associated protein
* Castleford, town in West Yorkshire know colloquially as Cas
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