The Mongolian Social Democratic Party (Mongolian: Монголын Социал Демократ Нам, Mongolyn Sotsial Demokrat Nam, sometimes also referred to as Sotsdek nam) is a political party in Mongolia.

Other prominent members included A.Ganbaatar, Losolyn Byambajargal and Radnaasümbereliin Gonchigdorj.

A considerable number of members came from the mathematics and physics departments of Mongolia's National University.

The party was part of the Mongolian Democratic Union that ruled from 1996 to 2000.

It reformed in 2004[1] and ran 19 candidates,[1] but did not win any seats at the 2012 Mongolian parliamentary elections.