Piast Faction (Polish: Stronnictwo Piast, SP), informally Piast Party, formerly Polish People's Party "Piast" (Polish: Polskie Stronnictwo Ludowe Piast, PSL Piast) was a political party founded in 2006. Piast refers to the medieval Piast dynasty, Poland's founding royal house. It was created after a 2006 split in the modern PSL party. Its major politicians included Zdzisław Podkański, Janusz Wojciechowski and Zbigniew Kuźmiuk. It was an affiliate party of Libertas.eu.

The party was allied with Law and Justice.