Szaniawski (feminine: Szaniawska, plural: Szaniawscy) is a Polish surname. Notable people with the surname include:
- Alfons Szaniawski (1837–1905), Russian general and activist
- Jerzy Szaniawski (1886–1970), Polish writer, playwright, and essayist
- Józef Kalasanty Szaniawski (1764–1843), Polish philosopher and politician