Uusimaa (Swedish: Nyland) is one of the 13 electoral districts of the Parliament of Finland, the national legislature of Finland. The district was established as Uusimaa Province (Finnish: Uudenmaan lääni; Swedish: Nylands län) in 1907 when the Diet of Finland was replaced by the Parliament of Finland. It was renamed Uusimaa in 1997. It is conterminous with the region of Uusimaa but excludes the municipality of Helsinki which has its own electoral district. The district currently elects 37 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 801,205 registered electors.