Kaisen may refer to:
People Kaisen Joki (快川紹喜, 1500–1582), Japanese Buddhist monk Jane Jin Kaisen (born 1980), Korean-Danish visual artist and filmmaker Olivier Kaisen (born 1983), Belgian cyclist Wilhelm Kaisen (1887–1979), German politician
Other uses Kaisen (circuit ship), a Japanese ship Kaisen: Outbreak, a Japanese professional wrestling event Kaisen Linux, a Linux distribution
See also Jujutsu Kaisen, a Japanese manga series Kaizen, a Japanese business term