Thirza is a female given name, a variant of Tirzah, and may refer to:
People
edit- Thirza Nash (1885–1962), South African novelist
- Lilian Thirza Charlotte Holt (1898–1983), British artist
- TJ Cuthand (born 1978, originally Thirza Cuthand), Canadian film-maker
- Thirza Petty, the wife of John Petty (1807–1868)
Fictional people
edit- Thirza Tapper, a character in The Farmer's Wife
Wildlife
edit- Anetia thirza, a butterfly