The Independent Democratic Party (Serbo-Croatian: Samostalna demokratska stranka, Самостална демократска странка; Slovene: Samostojna demokratska stranka, SDS) was a social liberal political party in the Kingdom of Serbs, Croats and Slovenes, and later the Kingdom of Yugoslavia.
In 1927, however, they reached an agreement with Stjepan Radić's Croatian Peasant Party, forming the Peasant-Democratic Opposition, which demanded a decentralization of Yugoslavia.
After the establishment of the royal dictatorship of King Alexander I of Yugoslavia in January 1929, the party was officially dissolved, but continued to function underground, while its president Svetozar Pribićević went into exile.
Many of its members joined the officially sponsored Yugoslav Radical Peasants' Democracy (renamed to Yugoslav National Party in 1933), including the great majority of its Slovenian members.
After Pribićević's death in exile in 1936, the leader of the party became Srđan Budisavljević.