Kashiwagi (written: 柏木) is a Japanese surname. Notable people with the surname include:
Akio Kashiwagi (柏木 昭男), Japanese businessman
Dean T. Kashiwagi, an American academic
Hiroshi Kashiwagi (born 1922), Japanese-American poet, playwright and actor
Kumiko Kashiwagi (柏木 久美子) (born 1978), Japanese alpine skier
Shinsuke Kashiwagi (柏木 真介) (born 1981), Japanese basketball player
Soji Kashiwagi (born 1962), American journalist and playwright
Yōsuke Kashiwagi (柏木 陽介) (born 1987), Japanese footballer
Yuki Kashiwagi (柏木 由紀) (born 1991), Japanese idol and singer
Yukiko Kashiwagi (柏木 由紀子) (born 1947), Japanese actress
