| Abbreviation | Definition |
|---|---|
| SDCC | Senate Democratic Campaign Committee |
| SDEC | State Democratic Executive Committee |
| SDF | Syrian Democratic Forces |
| SDFP | Scottish Democratic Fascist Party |
| SDHP | Social Democrat Hunchakian Party |
| SDLA | Social Democratic League of America |
| SDLP | Social Democrat and Labour Party |
| SDLP | Social Democratic and Labour Party |
| SDMP | Social Democratic Mega Party |
| SDP | Security, Democracy, Prosperity |
| SDP | Singapore Democratic Party |
| SDP | Social Democratic Party |
| SDP | Socialist Democratic Party |
| SDPC | Social Democratic Party of China |
| SDPC | Social Democratic Party of Croatia |
| SDPF | Social Democratic Party of Finland |
| SDPI | Social Democratic Party of India |
| SDPI | Socialist Democratic Party of India |
| SDPJ | Social Democratic Party Japan |
| SDPK | Social Democratic Party of Kyrgyzstan |