Siwiec is a Polish surname. It may refer to:
- Marek Siwiec (born 1955), Polish politician and journalist
- Natalia Siwiec (born 1983), Polish glamour model
- Ryszard Siwiec (1909–1968), Polish anti-communist
See also
edit- [Grey-surname]]
Siwiec is a Polish surname. It may refer to: