The fibular retinacula (also known as peroneal retinacula) are fibrous retaining bands that bind down the tendons of the fibularis longus and fibularis brevis muscles as they run across the side of the ankle. (Retinaculum is Latin for "retainer.")

These bands consist of the superior fibular retinaculum and the inferior fibular retinaculum. The superior fibers are attached above to the lateral malleolus