Grzegorz Bernard Napieralski is a Polish politician. He is an MP and was chairman of the Democratic Left Alliance (SLD) from 2008 to 2011.

The Democratic Left Alliance was a social-democratic political party in Poland. It was formed on 9 July 1991 as an electoral alliance of centre-left parties, and became a single party on 15 April 1999. It was the major coalition party in Poland between 1993 and 1997, and between 2001 and 2005, with four Prime ministers coming from the party: Józef Oleksy, Włodzimierz Cimoszewicz, Leszek Miller and Marek Belka. It then faded into opposition, overshadowed by the rise of Civic Platform and Law and Justice.