Unsen (雲仙, written as 雲僊; fl. c. 1873 - 1875) was a Japanese woodblock print artist of the early Meiji period. An obscure and mysterious figure who was only briefly active, he may have been the same person as the painter Koyama Unsen (小山雲泉, 1855 - 1911). Only a few surviving works are attributed to him, but he appears to have been mentioned in a directory of artists whose work was presented at the 1893 World's Columbian Exposition, deepening the mystery around his identity and works.