The Gibraltar Social Democrats (GSD) is a liberal-conservative, centre-right political party in Gibraltar. The GSD was the governing party for four successive terms in office under the leadership of Peter Caruana, from the 1996 general election until the party's electoral defeat in the 2011 election by the GSLP–Liberal Alliance.

Sir Peter Richard Caruana, is a Gibraltarian former politician who served as Chief Minister of Gibraltar from 1996 to 2011 and Leader of the Gibraltar Social Democrats (GSD) from 1991 to 2013. He is the longest serving Chief Minister to date.