Parliamentary elections were held in Slovenia on 21 September 2008 to elect the 90 deputies of the National Assembly. 17 parties filed to run in the election, including all nine parliamentary parties. The election was won by the Social Democrats (SD), who then went on to form a government together with Zares, Liberal Democracy of Slovenia (LDS) and the Democratic Party of Pensioners of Slovenia (DeSUS).

The National Assembly is the general representative body of Slovenia. According to the Constitution of Slovenia and the Constitutional Court of Slovenia, it is the major part of the distinctively incompletely bicameral Slovenian Parliament, the legislative branch of the Republic of Slovenia. It has 90 members, elected for a four-year term. 88 members are elected using the party-list proportional representation system and the remaining two, using the Borda count, by the Hungarian and Italian-speaking ethnic minorities, who have an absolute veto in matters concerning their ethnic groups.