Koizumi Kengorō (小泉兼五郎; fl. c. 1860 - 1865), often simply as Koizumi Kane (小泉兼), was an engraver of ukiyo-e woodblock prints in the late Edo and early Meiji periods. He collaborated with many of the great artists of the mid-late 19th century, including Kunisada, Sadahide, and Tsukioka Yoshitoshi. His older brother, Koizumi Minokichi, was also a prominent woodblock engraver.