The flexor digiti minimi brevis (foot) is a muscle that is located on the outer edge of the foot bones. It begins at the fifth metatarsal (the bone behind the bones of the pinky toe) and sheath of the peroneus longus muscle, located in the sole of the foot. It runs about a third of the length of the foot, inserting at the bottom of the pinky toe’s backmost bone.

The flexor digiti minimi brevis of the foot is one of the muscles that comprises the third layer of the sole of the foot, the fourth layer being the deepest.

The nerve for this muscle is the superior branch of the lateral plantar nerve.

The flexor digiti minimi brevis muscle of the foot is used to flex the metatarsophalangeal joint of the small toe. This means it is involved with walking and balance.

The flexor digiti minimi brevis, not to be confused with the muscle of the same name in the hand, may sometimes be called by other names, including the flexor brevis minimi digiti and the flexor digiti quinti brevis.