Rainer Sarnet
- Birthday: 1969-03-03
- Place of birth: Rakvere, Lääne-Viru County, Estonian SSR, USSR [now Estonia]
Rainer Sarnet (born March 3, 1969) is an Estonian film director whose work started in animation. He then worked in advertising and publishing. His works include The Invisible Fight, November, The Idiot and Where Souls Go.
