The Slovenian Democratic Party (SDS — Slovenian: Slovenska demokratska stranka), previously the Social Democratic Party of Slovenia (Slovenian: Socialdemokratska stranka Slovenije) is a Slovenian centrist liberal conservative party. It is led by Prime Minister Janez Janša.

Currently, the SDS is the largest political group represented in the Slovenian Parliament (with 29 MPs or 32,2% of the total). At the European election it got 17.7% which yielded 2 seats in the European parliament out of a total 7 from Slovenia. It is a member of the European People's Party (EPP) and its MEPs sit in the EPP-ED Group.