The 2013 Lower Saxony state election was held on 20 January 2013 to elect the members of the 17th Landtag of Lower Saxony. The incumbent coalition government of the Christian Democratic Union (CDU) and Free Democratic Party (FDP) led by Minister-President David McAllister was defeated. The Social Democratic Party (SPD) formed a government with The Greens which held a slim, one-seat majority. Stephan Weil was subsequently elected Minister-President.

The Lower Saxon Landtag or the Parliament of Lower Saxony is the state diet of the German state of Lower Saxony. It convenes in Hanover and currently consists of 146 members, consisting of four parties. Since 2022 the majority is a coalition of the Social Democratic Party and the Greens, supporting the cabinet of Minister-President Stephan Weil (SPD).