Legislative elections were held in South Korea on 13 April 2016. All 300 members of the National Assembly were elected, 253 from first-past-the-post constituencies and 47 from proportional party lists. The election was an upset victory for the liberal Democratic Party, which defied opinion polling by winning a plurality of seats in the election and defeating the ruling conservative Saenuri Party by one seat. In votes for party lists, however, Democratic Party came third, behind the Saenuri Party in first place and the new People Party in second.

The Democratic Party of Korea, formerly known as the New Politics Alliance for Democracy, is a centrist-liberal South Korean political party. The DPK and its rival, the People Power Party (PPP), form the two major political parties of South Korea.