Piet may refer to:
- Purushottam Institute of Engineering and Technology, Rourkela, Orissa, India
- Piet (given name), a common name in the Netherlands and South Africa
- Henri Piet (1888-1915), French lightweight boxer
- Tony Piet (1906-1981), American Major League Baseball player
- Piet (programming language)
- Piet (horse), American thoroughbred racehorse
- P.I.E.T
- PIET