In humans, the calcaneus (from the Latin calcaneum, meaning heel) or heel bone is a bone of the tarsus of the foot which constitute the heel. In some other animals, it is the point of the hock.

In humans, the calcaneus is the largest of the tarsal bones and the largest bone of the foot. In it, several important structures can be distinguished:

The posterior half of the bone is the tuber calcanei. On its lower edge on either sides are its lateral and medial processes (serving as the origins of the abductor hallucis and abductor digit minimi). The Achilles tendon is inserted into a roughened area on its superior side, the cuboid bone articulates with its anterior side, and on its superior side are three articular surfaces for the articulation with the talus bone. Between these superior articulations and the equivalents on the talus is the tarsal sinus (a canal occupied by the interosseous talocalcaneal ligament). On the medial side of the bone, below the middle talar facet, is the sustentaculum tali (which serves for the attachment of several other ligaments). On the lateral side is commonly a tubercle called the peroneal trochlea, under which is a groove for the tendon of the peroneus longus.