The tantalus monkey (Chlorocebus tantalus) is an Old World monkey from Africa that ranges from Ghana to Sudan. It was originally described as a subspecies of the grivet (Chlorocebus aethiops). All species in Chlorocebus were formerly in the genus Cercopithecus. It is a common species with a wide range, and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".

A medium-sized species, the tantalus monkey has a black face and a long tail. There is a distinctive undulating white or yellowish browband above the eyes. The cheeks and temples are white, the long hairs being swept backwards and often covering the ears in older individuals. The crown and dorsal surface of the body is grizzled and greenish or golden. The underparts are white and the tail and outer surfaces of the limbs grey. The tail may have a whitish tip. The male is larger than the female and has a bright blue scrotum surrounded by orange hairs.

This monkey is found in tropical central Africa. Its native range includes Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Congo, Democratic Republic of Congo, Ghana, Kenya, Niger, Nigeria, South Sudan, Sudan, Togo and Uganda. It is an adaptable species able to inhabit open woodland, savannah, forest-grassland mosaic and riverside forest. It is at home in secondary forest and rural and urban locations. 

Budgett's Tantalus Monkey (Chlorocebus tantalus budgetti) Various locations in Uganda