Serbian Social Democratic Party (Kingdom of Serbia)

Prominent leaders included Dimitrije Tucović, Dragiša Lapčević, and Dušan A.

[3] It ceased to exist after World War I with the creation of the Kingdom of Serbs, Croats and Slovenes, when in 1919 the social democrats joined the new Socialist Workers' Party of Yugoslavia (of Communists) (Socijalistička radnička partija Jugoslavije (komunista)), the predecessor of the Communist Party of Yugoslavia.

[4] In 1903 a split emerged within the SSDP between the Marxists, led by Radovan Dragović and Dimitrije Tucović, and the so-called "opportunists", who insisted on the primacy of trade unionism over political struggle.

The SSDP participated in the First Balkan Socialist Conference held on 7–9 January 1910 in Belgrade.

During the revolutionary upswing that occurred in Serbia under the influence of the October Revolution, the SSDP merged with the Socialist Workers’ Party of Yugoslavia (of Communists) at the latter’s first (Unification) Congress, held in April 1919.

Members of the party shown at a May Day celebration in 1905.
The party was organized around a paper called Radničke novine (the Workers' Journal)