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The Social Democratic Party (French: Parti social-démocrate, PSD) is a political party in Gabon. It is part of the Presidential Majority coalition and is led by Pierre Claver Maganga Moussavou.

The PSD was established in 1991.^[1] Maganga Moussavou was nominated as its candidate for the 1993 presidential election, finishing fourth in a field of thirteen candidates with 3.6% of the vote. He ran again in the 1998 presidential election, this time finishing fifth out of the eight candidates with 1% of the vote.

The party won a single seat in the National Assembly in the 2001 parliamentary election, and subsequently joined the Gabonese Democratic Party (PDG)-led government.^[2] It did not put forward a candidate for the 2005 presidential election, but won two seat in the 2006 parliamentary election, in which it was part of the pro-PDG bloc.^[3]

Maganga Moussavou was nominated as the PSD candidate for the 2009 presidential election, finishing sixth in a field of eighteen candidates with 0.8% of the vote.^[3] The party was reduced to one seat in the 2011 parliamentary election.^[3]