The 2003 Northern Mariana Islands general election was held on Monday, 3 November 2003, electing members to the legislature. The 2003 elections also marked the first general election that the dissolved Reform Party, which merged back into the Democratic Party in 2002, would not appear on the ballot.
The Northern Mariana Islands Senate is the upper house of the Northern Mariana Islands Commonwealth Legislature, consisting of nine senators representing three senatorial districts (Saipan & the Northern Islands, Tinian & Aguijan, and Rota), each a Multi-member district with three senators. Each district had one seat open for the 2003 elections.
The Northern Mariana Islands House of Representatives is the lower house of the Northern Mariana Islands Commonwealth Legislature. The house has six districts, several of which are Multi-member district. All 18 seats in the Northern Mariana Islands House of Representatives were contested in the 2003 election.