Geoffroy's Spider Monkey, Ateles geoffroyi, also known as Black-handed Spider Monkey, is a species of spider monkey, a type of New World monkey, from Central America, parts of Mexico and possibly a small portion of Colombia. There are at least five subspecies. Some primatologists classify the Black-headed Spider Monkey, A. fusciceps, found in Panama, Colombia and Ecuador as the same species as Geoffroy's Spider Monkey. It is one of the largest New World monkeys, often weighing as much as 9 kilograms. Its arms are significantly longer than its legs, and it has a prehensile tail that can support the entire weight of the monkey and that is used as an extra limb. Its hands have only a vestigial thumb, but long, strong hook-like fingers. These adaptations allow the monkey to move by swinging by its arms beneath the tree branches. Geoffroy's Spider Monkey lives in fission–fusion societies that contain between 20 and 42 members. Its diet consists primarily of ripe fruit and it requires large tracts of forest to survive. As a result of habitat loss, hunting and capture for the pet trade, it is considered to be endangered by the International Union for Conservation of Nature (IUCN).

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