Kashin (masculine, ) or Kashina (feminine, ) is a Russian surname. Notable people with the surname include:
Anna Kashina, Russian writer Daniil Kashin (1769–1841), Russian composer Kendo Kashin (born 1968), ring name of the Japanese wrestler Tokimitsu Ishizawa Nikolay Kashin, Russian physician and discoverer of the Kashin–Beck disease Oleg Kashin (born 1980), Russian journalist and seaman