The Eleventh Seimas of Lithuania was a parliament (Seimas) elected in Lithuania. Elections took place on 14 October 2012, with the run-off on 28 October. The Seimas commenced its work on 17 November 2012 and served a four-year term, with the last session taking place on 10 November 2016.

The Seimas of the Republic of Lithuania, or simply the Seimas, is the unicameral legislative body of the Republic of Lithuania. The Seimas constitutes the legislative branch of government in Lithuania, enacting laws and amendments to the Constitution, passing the budget, confirming the Prime Minister and the Government and controlling their activities.