Microsciurus santanderensis (Hernández-Camacho, 1957) is a sciurid commonly called the Santander dwarf squirrel. M. santanderensis is a small tree squirrel with orange and black mixed fur and is 1 of 4 species in the genus Microsciurus. Endemic to Colombia, South America, in forests at elevations up to 3,800 m, M. santanderensis is listed as “Data Deficient” by the International Union for Conservation of Nature and Natural Resources, and more research is needed to determine its conservation needs.