Kashiwagi (written: 柏木) is a Japanese surname. Notable people with the surname include:
, Japanese businessman Dean T. Kashiwagi (1952–2025), American economist Hiroaki Kashiwagi (born 1982), Japanese curler Hiroshi Kashiwagi (1922–2019), Japanese-American poet, playwright and actor , Japanese alpine skier , Japanese basketball player Soji Kashiwagi (born 1962), American journalist and playwright , Japanese footballer , Japanese idol and singer , Japanese actress