Caryocar nuciferum, the butter-nut of Guiana, is a fruit tree native to Central and South America.

The large coconut-sized fruit, weighs about 3 kilograms (6.6 lb), is round or pear-shaped some 10–15 centimetres (4–6 in) in diameter, and greyish-brown in colour.

"[1] Pulp of the mesocarp is oily and sticky, holding 1–4 hard, woody, warty stones, with tasty, reniform endocarp.

Caryocar nuciferum is illustrated and discussed in detail in Curtis's Botanical Magazine volume 54 (1827), and figured on plates 2727 and 2728 using material sent from the island of Saint Vincent by Lansdown Guilding.

The species is native to Costa Rica, Panama, northern Brazil, Colombia, Guyana, and Venezuela.