Thia (disambiguation)
Thia is a genus of crabs
Thia may also refer to:
- Tegeticula, a prodoxid moth genus invalidly described as Thia by H. Edwards in 1888
 - 405 Thia, an asteroid
 - Thia Megia (born 1995), a contestant in the 10th season of American Idol
 - Henry Thia (born 1952), Singaporean actor and comedian
 - Shawn Thia (born 1995), Singaporean actor