Kuroiwa (黒岩) is a Japanese family name meaning 'black stone'. Notable people with the surname include:
Akira Kuroiwa (born 1961), a Japanese ice speed skaterHisami Kuroiwa, Japanese film producerMamoru Kuroiwa (born 1962), a Japanese Olympic boxerShuroku Kuroiwa, also known as Ruikō Kuroiwa, a Japanese journalist and novelistToshio Kuroiwa, a Japanese military pilot who was stationed on Japanese aircraft carrier KagaToshiyuki Kuroiwa (born 1969), a Japanese ice speed skaterYoshihiro Kuroiwa, a manga artist on ZenkiFictional characters:
Geki Kuroiwa, a character in the Japanese anime series Brave Command Dagwon