Haku (written: 白 or 朴) is a Japanese surname. Notable people with the surname include:
Shinkun Haku (白 眞勲; born 1958), Japanese politician
Kiyoko Haku (朴 清子), better known as Kiyoko Arai, Japanese manga artist
Maki Haku (白 巻; 1924–2000), Japanese artist