Kaji is a Japanese surname. Notable persons with that name include:
Akira Kaji (born 1980), Japanese footballer
Maki Kaji (born 1951), Japanese businessman
Masaki Kaji (born 1988), Japanese actor and singer
Meiko Kaji (born 1947), Japanese actress and singer
Ryuichi Kaji (1896–1978), Japanese journalist and political critic
Shungo Kaji (born 1961), Japanese film director, screenwriter, producer and company executive
Wataru Kaji (1903–1982), Japanese writer
Yūki Kaji (born 1985), Japanese voice actor
