Tongatapu 1 is an electoral constituency for the Legislative Assembly in the Kingdom of Tonga. It was established for the November 2010 general election, when the multi-seat regional constituencies for People's Representatives were replaced by single-seat constituencies, electing one representative via the first past the post electoral system. Located on the country's main island, Tongatapu, it encompasses the villages of Kolomotuʻa, Tongataʻeapa, Tufuenga, Sopu-ʻo-Taufaʻahau, ʻIsileli, Halaʻo vave, Tuʻatakilangi, Longolongo, Vaololoa, and Kapeta.