By-election were held on 5 May 2005 to fill vacancies in Tongatapu and Niuas following the appointment of Feleti Sevele and Sione Haukinima to the cabinet.
By-elections were held on 5 May 2005 to replace vacant seats in Tongatapu and Niuas after high-ranking government officials, Feleti Sevele and Sione Haukinima, took on new roles in the cabinet.