Southeast Finland is one of the 13 electoral districts of the Parliament of Finland, the national legislature of Finland. The district was established in 2013 by the merger of Kymi and South Savo districts. It is conterminous with the regions of Kymenlaakso, South Karelia and South Savo. The district currently elects 15 of the 200 members of the Parliament of Finland using the open party-list proportional representation electoral system. At the 2023 parliamentary election it had 353,468 registered electors.