巨狐猴（Megaladapis）是马达加斯加已灭绝的一属灵长目。

巨狐猴的近亲是鼬狐猴，并与另外两个属组成了鼬狐猴科。但是巨狐猴与其他的狐猴有很大分别。牠的身体矮胖，像现今的树熊。牠的手臂及手指很长，适合抓树，脚则呈八字形适合直立攀爬。

巨狐猴的头部不像其他的灵长目，头颅骨在灵长目中很独特，鼻的部份像黑犀牛，且可能有特大的上唇。牠的犬齿很长，颚骨像牛的，形成很长的鼻端。牠的颚肌很强壮，可以咬碎粗糙的植物。牠们约重50公斤。

Megaladapis, informally known as koala lemur, is an extinct genus belonging to the family Megaladapidae, consisting of three extinct species of lemurs that once inhabited the island of Madagascar. The largest measured between 1.3 to 1.5 m (4 to 5 ft) in length.