Kasai (written: 河西, 葛西 or 笠井) is a Japanese surname. Notable people with the surname include:
, Japanese politician , Japanese dancer , Japanese Nordic combined skier and ski jumper , Japanese ice hockey player , Japanese professional wrestler , Japanese anime director , Japanese table tennis player , Japanese football player , retired Japanese jazz singer , former Japanese volleyball player , Japanese surgeon , Japanese ski jumper , Japanese singer, actress and a former member of the idol group AKB48 née Kasai (born 1980), Japanese ski jumper , Japanese boxer and boxing trainer , Japanese Nordic combined skier and ski jumper
See also Kasai clan