Sosei

thumb|Sosei Hōshi by Kanō Tan'yū, 1648

Sosei (, 844 – 910) was a Japanese waka poet and Buddhist priest. He is listed as one of the Thirty-six Poetry Immortals, and one of his poems was included in the famous anthology Hyakunin Isshu. His father Henjō was also a waka poet and monk.