Cașin may refer to the following places in Romania:
Cașin, a commune in Bacău County Cașin (Râul Negru), a tributary of the Râul Negru in Covasna County Cașin (Trotuș), a tributary of the Trotuș in Bacău County Mănăstirea Cașin, a commune in Bacău County, Romania Cașin Church, a Romanian Orthodox church located in Bucharest, Romania