Peroneus tertiu is often appears to be part of extensor digitorum longus, and might be described as its ‘fifth tendon’. The muscle fibres operating on this tendon arise from the distal third or more of the medial surface of the fibula, the adjoining anterior surface of the interosseous membrane, and the anterior crural intermuscular septum. During routine dissection for the first MBBS students, we observed that the peroneus tertius was absent on the dorsum of the left lower limb of a 70 years old, donated embalmed male cadaver in the Department of Anatomy, K.J.Somaiya Medical College,Sion,Mumbai,India. The photographs of the dorsum of the foot were taken for proper documentation and for ready reference. The absence of the peroneus tertius is very rare and not found in literature. The absent peroneus tertius is an interesting finding, which could be clinically important for Anatomists, Anthropologists, Surgeons and Orthopedic surgeons.