Costal may refer to:
- an adjective related to the rib (Costa in Latin) in anatomy
- Costal cartilage, a type of cartilage forming bars which serve to prolong the ribs forward
- Costal facet (disambiguation)
- Costal margin, the medial margin formed by the false ribs
- Costal surface (disambiguation)
- Costal groove, a groove between the ridge of the internal surface of the rib
- Costal vein, a type of insect wing segment in the Comstock-Needham system