Riccardo Nencini (born 19 October 1959) is an Italian politician.
Nencini was born at Barberino di Mugello, in the province of Florence. He is the son of professional cyclist Gastone Nencini, winner of the 1960 Tour de France. A long-time member of the Italian Socialist Party (PSI), he joined the Italian Socialists (SI) in 1994 and the Italian Democratic Socialists (SDI) in 1998.
From 1994 to 1999 he was member of the European Parliament. From 2000 to 2010 he was President of the Regional Council of Tuscany.
5 July 2008 he became Secretary of the Socialist Party.