is a species of flowering plant in the family Saxifragaceae that is endemic to Japan.
The species was first described, as Chrysosplenium flagelliferum var. tosaense, by Japanese botanist Makino Tomitarà  in 1901 (his 1892 mention of Chrysosplenium tosaense is a nomen nudum). In 1935, Sutà  Chiharu elevated the variety to species rank. The specific epithet relates to the type locality, Nanokawa in Kà Âchi Prefecture (formerly Tosa Province).
Chrysosplenium tosaense grows to a height of and flowers from April to May.
Chrysosplenium tosaense is endemic to Japan, where it occurs from the Kantà  region to the Chà «goku region of Honshà «, Shikoku, and Kyà «shà «.