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 of Slovakia CAS, a 2018 album by 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