The calvaria, also known as the skullcap or the calvarium, is the upper or superior part of the skull. It does not contain the bones that make up the jaw or the parts of the skull that make up the face.

The calvaria is made up of four primary bone structures: the frontal bone, the two parietal bones, the two temporal bones, and the occipital bone. It is a thick and hard structure that primarily exists to protect the brain from harm. Its shape varies from person to person; in some people, the skullcap takes the shape of an oval, while in others it is almost perfectly circular.