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This article is about the concave surface of the pelvis. For other uses of the term Acetabulum, please see Acetabulum (disambiguation).

The acetabulum is the concave articular surface of the pelvis, formed by the parts of three bones, the ilium, ischium, and pubis. The head of the femur articulates with the pelvis at the acetabulum, forming the hip joint. In reptiles and in birds, the acetabulum are deep sockets. It has its counterpart in the pectoral girdle, namely, glenoid fossa.

The word acetabulum originally meant 'little vinegar cup,' and was the Latin word for a small vessel for storing vinegar. The word was later also used as a unit of volume, equal to roughly 270ml.