Niuatoputapu was the indigenous language of Niuatoputapu, Tonga. It was more closely related to Samoan than to Tongan. Sometime in the 18th or 19th century, it became extinct and its use was replaced by Tongan. Practically all knowledge of the Niuatoputapu language comes from a word list compiled by Jacob Le Maire in 1616.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, eds. (2016). "Niuatoputapu". Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.
- "Niuatoputapu - Languages facts sheet by Niklas Jonsson", Niklas Jonsson, 16 December 1998