Dame Teuila Mary Percival DNZM QSO (née Siatu'u) is a New Zealand paediatrician and health researcher.

[1] Her father was born in Samoa and her mother's family came from Blackpool in England; they met in Auckland when both were training to become radiographers.

[1] Percival was educated at Thames High School, and went on to study medicine at the University of Auckland, graduating MB ChB in 1983.

[4][6] Percival has established programmes to encourage healthy eating and address childhood obesity in South Auckland and was involved in the formation of Mana Kids clinics at 88 schools in the area.

[8] She was appointed a Dame Companion of the New Zealand Order of Merit, for services to health and the Pacific community, in the 2023 King's Birthday and Coronation Honours.