Melocactus caroli-linnaei is a cactus (a member of the family Cactaceae) found in Jamaica.

Like all species of Melocactus, it forms a "cephalium" when mature – a dense mass of areoles covered with wool and spines at the tip of the stem.

[2] Melocactus caroli-linnaei grows with cylindrical green stems and reaches a size of up to 1 meter in height.

In 1991, Nigel Taylor gave the species its current name, Melocactus caroli-linnaei.

[2] In 1922, Nathaniel Lord Britton and Joseph Nelson Rose, in their work The Cactaceae, restricted the use of the name Cactus melocactus back to the Jamaican species only.