| Social Democratic Party | |
| Colorcode: | red |
| Leader: | Sreten Jakšić |
| Founded: | 28 June 1909 |
| Dissolved: | Prior May 1919 |
| Merged: | SRPJ(k) |
| Ideology: | Marxism Yugoslav unionism |
| Position: | Left-wing |
| International: | Second International |
| Country: | Bosnia and Herzegovina |
The Social Democratic Party of Bosnia–Herzegovina (Serbo-Croatian: Socijaldemokratska stranka Bosne i Hercegovine / Социјалдемократска странка Босне и Херцеговине) was a left-wing Marxist political party, active in the Austro-Hungarian Condominium of Bosnia–Herzegovina.
The party was active from 1909 until 1919 when it merged into the Socialist Workers' Party of Yugoslavia (of Communists), the predecessor of the Communist Party of Yugoslavia (KPJ). The party was led by Sreten Jakšić.