Ihaia Te Ahu (c. 1820–1895) was a notable New Zealand teacher and missionary. Of Māori descent, he identified with the Te Uri Taniwha hapū of the Ngāpuhi iwi. He was born in Okaihau, Northland, New Zealand. In about 1832 he attended the Kerikeri Mission Station of Church Missionary Society (CMS). In 1832 he went with the Rev. Thomas Chapman to live at the Rotorua Mission of the CMS. From about 1835 he acted as the assistant teacher with the Rev. Chapman at Rotorua and from 1845 he was taking Sunday services when Chapman was absent.