- Abbreviation
- SDE
- Leader
- Lauri Läänemets
- Founder
- Marju Lauristin
- Founded
- 8 September 1990 ; 35 years ago ( 1990-09-08 )
- Headquarters
- Toompuiestee 16, Tallinn 10137
- Youth wing
- Young Social Democrats
- Membership 2021
- 5,337
- Ideology
- Social democracy , Pro-Europeanism
- Political position
- Centre-left
- European affiliation
- Party of European Socialists
- European parliament group
- Progressive Alliance of Socialists and Democrats
- International affiliation
- Progressive Alliance , Socialist International (1990–2017)