Mucia Tertia was a Roman matrona who lived in the 1st century BC. She was the daughter of Quintus Mucius Scaevola, the pontifex maximus, consul in 95 BC. Her mother was a Licinia that divorced her father to marry Quintus Caecilius Metellus Nepos, in a scandal mentioned by several sources. Her name, Mucia Tertia, would suggest that she was a third daughter, according to the Roman naming convention for women, though it is believed that this was instead to differentiate her from her two aunts.