The genus name Thalia may refer to:
- Animalia:
- Thalia Bruguière, 1791.
- Thalia Blumenbach, 1827 (Salpidae, Urochordata)
- Thalia Hope, 1838: 70 (junior homonym) = Poecilus Bonelli, 1810 (Carabidae, Coleoptera, Insecta)
- Plantae:
- Thalia L. (Marantaceae, Monocots, Angiosperms)