In Greek mythology, Thalia or Thaleia ("good cheer") was the muse of comedy and pastoral poetry. She was a rural goddess with the attributes of a comic mask and a shepherd's crook. Her names came from θάλλεω, meaning "to bloom". By the god Apollo came the Corybantes, priests who castrated themselves in accordance to the goddess Cybele.
Thalia is sometimes referred to as Thasia.