Elachistocleis pearsei (common name: Colombian plump frog) is a species of frog in the family Microhylidae.

[1][2][3] It is found in the Pacific versant of western Costa Rica,[2] Panama, Caribbean lowlands of Colombia and into the Magdalena River Valley, and in northwest Venezuela.

[4] Elachistocleis pearsei is a nocturnal and fossorial lowland frog occurring at elevations less than 750 m (2,460 ft).

Breeding takes place in temporary and permanent pools after the rains.

[1] The specific name pearsei honors Arthur Sperry Pearse, an American zoologist.