In Greek mythology, Thalia (/θəˈlaɪə/[1][2] or /ˈθeɪliə/;[3] Ancient Greek: Θάλεια; "the joyous, the flourishing", from Ancient Greek: θάλλειν, thállein; "to flourish, to be verdant"), also spelled Thaleia, was one of the Muses, the goddess who presided over comedy and idyllic poetry.

[4] Thalia was portrayed as a young woman with a joyous air, crowned with ivy, wearing boots and holding a comic mask in her hand.

Many of her statues also hold a bugle and a trumpet, or occasionally a shepherd's staff or a wreath of ivy.

Thalia was the daughter of Zeus and Mnemosyne, the eighth-born of the nine Muses.

According to Apollodorus, she and Apollo were the parents of the Corybantes.