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| Leader: | Hasan Rıza |
| Social Democrat Party | |
| Native Name: | Sosyal Demokrat Fırkası |
| Leader1 Title: | Last Leader |
| Leader1 Name: | Mehmet Atıf Tüzün |
| General Secretary: | Yorgaki Habib |
| Headquarters: | 104 Kebir St. Şişli, Istanbul |
| Ideology: | Fourteen Points Ottomanism Social democracy Representative democracy |
| Position: | Left-wing |
| Country: | Turkey |
The Social Democrat Party (Turkish, Ottoman (1500-1928);: Sosyal Demokrat Fırkası) was a short-lived social democratic political party in the Ottoman Empire, founded in the aftermath of the First World War.[1] [2] [3] Notable members included Mehmet Esat Işık, Ata Atalay, Osman Nuri Eralp, Samipaşazade Sezai, Hamdi Bey, Yorgaki Efendi, Ubeydullah Bey, and Besim Ömer Akalın.
It was a member of the Second International. It sent a representative to the Sultanate Council, a faux-parliament organized by Mehmed VI and Damat Ferid Pasha in between the dissolution of the 5th parliament in 1918 and the 1919 general election. The party failed to win representation in the 1919 election.