The Bulgarian Social Democratic Workers Party (Broad Socialists) (Bulgarian: Българска работническа социалдемократическа партия (широки социалисти), Balgarska rabotnicheska sotsialdemokraticheska partiya (shiroki sotsialisti)) was a reformist socialist political party in Bulgaria.
The 'Broad Socialist' faction had appeared inside the pre-split party around 1900, when Yanko Sakazov had started the magazine Obshto delo ('Common Action').
The grouping would function as a leftwing tendency inside the Broad Socialist party for the years to come.
The rightist tendency inside the party ran a newspaper of their own, Epoha, between 1923 and 1925.
It was represented by Sakazov in the LSI Executive during the entire existence of the International (until August 1925 Sakazov's seat was shared with the Yugoslav socialist leader Živko Topalović).