Tertia (died after 74 BC) was an ancient Roman actress and dancer.
She is famous in history as the mistress of Verres, after he was appointed governor of Sicily in 74 BC.
The relationship attracted a scandal and was brought up in court during the corruption trial against Verres.
[1] Verres caused a scandal by showing himself openly with Tertia in public, allowing her to act as his hostess during public functions and introducing her to local dignitaries and aristocracy, which was regarded as scandalous because of the low social status of stage artists.
It was reportedly Tertia and a courtesan named Pippa who introduced Verres to the courtesan Chelidon, who were alleged to have great political influence upon his tenure as urban praetor.