Supernumerary heads of the biceps brachii muscle have been widely studied regarding their origin, insertion, size, innervation and racial differences. The most frequent variation of the biceps brachii is its supernumerary heads. During our routine dissection studies, we encountered supernumerary head of the biceps brachii muscle on two cadavers. Additionally, the supernumerary heads had abnormal attachments. We think that such variations should be kept in mind during surgical and diagnostic procedures.