General elections were held in Belize on 5 March 2003. Belizeans elected 29 members to the House of Representatives for a term of five years. The result was a victory for the ruling People's United Party (PUP), which won 22 of the 29 seats.

The United Democratic Party is one of the two major political parties in Belize. It is currently the main opposition party, having lost the 2020 Belizean general election, after previously holding the government across three prior terms. Founded as a centre-right conservative party, the UDP is led by Moses Barrow.