Social Democratic Workers' Party may refer to one of the following parties:

Social Democratic Workers' Party (Netherlands) Social Democratic Workers' Party of Austria Social Democratic Workers' Party of Germany Latvian Social Democratic Workers' Party Estonian Social Democratic Workers' Party Russian Social Democratic Labour Party Swedish Social Democratic Workers' Party German Social Democratic Workers' Party in the Czechoslovak Republic Czechoslovak Social Democratic Workers' Party Czechoslovak Social Democratic Workers Party in the Republic of Austria Social Democratic Workers' Party in Subcarpathian Rus'