Social Democracy of the Republic of Poland (SdRP) was a social democratic party in Poland that existed from 28 January 1990 to 15 April 1999. The party was founded by former Polish United Workers' Party members, including president Aleksander Kwasniewski, Sejm speaker Jozef Oleksy, and Prime Minister Leszek Miller. In 1999, the party folded into the Democratic Left Alliance.