Portrait of a Young Woman is a painting which is commonly believed to be by the Italian Renaissance painter Sandro Botticelli, executed between 1480 and 1485. Others attribute authorship to Jacopo da Sellaio. The woman is shown in profile but with her bust turned in three-quarter view to reveal a cameo medallion she is wearing around her neck. The medallion is a copy in reverse of "Nero's Seal", a famous antique carnelian representing Apollo and Marsyas, which belonged to Lorenzo de' Medici.