Callistosporium luteo-olivaceum is a species of agaric fungus in the family Tricholomataceae. It was originally described in 1859 as Agaricus luteo-olivaceus by Miles Joseph Berkeley and Moses Ashley Curtis in 1859. Rolf Singer transferred it to Callistosporium in 1946. The fungus has an extensive synonymy. Although rare, C. luteo-olivaceum is widely distributed in temperate and tropical areas of Europe and North America. In 2014, it was reported growing in pine forests in Western Himalaya, Pakistan.