In vertebrate anatomy, ribs are the long curved bones which form the rib cage. In most tetrapods, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the chest cavity. They serve to protect the lungs, heart, and other internal organs of the thorax. In some animals, especially snakes, ribs may provide support and protection for the entire body.

Rib or RIB may refer to:

• Rib, a bone attached to the spine, in vertebrate animals
• Ribs (food), the cooked meat and rib bones of a food animal
• Rib or costa, the leading edge of an insect wing (See glossary of Lepidopteran terms)