The 2013 Bavarian state election was held on 15 September 2013 to elect the 180 members of the 17th Landtag of Bavaria. It was held one week before the 2013 German federal election. The CSU regained the absolute majority it had lost in 2008, while the Free Democratic Party (FDP), a member of the outgoing governing coalition, fell below the 5% electoral threshold and lost all its seats. Minister-President Horst Seehofer continued in office.

The Christian Social Union in Bavaria is a Christian democratic and conservative political party in Germany. Having a regionalist identity, the CSU operates only in Bavaria while its larger counterpart, the Christian Democratic Union (CDU), operates in the other fifteen states of Germany. It differs from the CDU by being somewhat more conservative in social matters, following Catholic social teaching. The CSU is considered the de facto successor of the Weimar-era Catholic Bavarian People's Party.