The cacomistle, Bassariscus sumichrasti, is a nocturnal, arboreal and omnivorous member of the carnivoran family Procyonidae. Its preferred habitats are wet, tropical, evergreen woodlands and mountain forests, though seasonally it will venture into drier deciduous forests.

Nowhere in its range (from southern Mexico to western Panama) is B. sumichrasti common. This is especially true in Costa Rica, where it inhabits only a very small area. It is completely dependent on forest habitat, making it particularly susceptible to deforestation.

In IPA, its name is pronounced "cacomistle" [kækə-mɪksᵊl], or "cacomixle" [kækə-mɪsᵊl].

The term cacomistle is from the Nahuatl language (tlahcomiztli) and means "half cat" or "half mountain lion"; it is sometimes also used to refer to the ringtail, Bassariscus astutus, a similar species that inhabits arid northern Mexico and the American Southwest.

The cacomistle is part of the family Procyonidae which includes other small omnivores such as the raccoon and the Brazilian coati. The cacomistle and its close relative the ringtail cat are the only living species of the subfamily Procyoninae and the genus Bassariscus. Within the Cacomistle species there are 5 subspecies (Bassariscus sumichrasti variabilis, Bassariscus sumichrasti sumichrasti, Bassariscus sumichrasti oaxacensis, Bassariscus sumichrasti notinus, and Bassariscus sumichrasti latrans).