The Decentralist Social Force Party also known as Social Force was a centre-left, social democratic, Peruvian political party. Founded in 1997 as the Party for Social Democracy, it changed to its current name in 2007 after incorporating members of the CONREDES de Junín Movement and the Cajamarca Social Force movement.

Susana María del Carmen Villarán de la Puente is a left politician in Peru, a former presidential candidate, and in municipal elections in 2010 became the first woman to be elected Mayor of Lima.