Sir Harawira Tiri Gardiner was a New Zealand soldier, public servant, and writer. He was Māori, of Ngāti Awa, Ngāti Pikiao, Whakatōhea, and Te Whānau-ā-Apanui descent.

Ngāti Awa is a Māori iwi (tribe) centred in the eastern Bay of Plenty Region of New Zealand. It is made of 22 hapū (subtribes), with 15,258 people claiming affiliation to the iwi in 2006. The Ngāti Awa people are primarily located in towns on the Rangitaiki Plain, including Whakatāne, Kawerau, Edgecumbe, Te Teko and Matatā. Two urban hapū also exist in Auckland and Wellington.