Donald (Tanard Areta) Mangai
- Born 5 July 1894, Te Aute, Hawkes Bay, New Zealand
- Died 13 April 1968, Pahiatua
- Last rank Private
- Service number 20631
- Served In Māori Contingent, 7th Reinforcements
- Next of Kin Mrs Hemaima Mangai (mother), Ōpapa, Hawke's Bay
- Pre-war occupation Shearer at Hokorou Station, Te Kāraha
- ReligionMormon
- Enlisted11 May 1916, aged 21 years
- Embarkationaboard HMNZT 61, Aparima, departed 19 August 1916, disembarked 24 October 1916, Devonport, Devon, England
- Theatres of operationWestern European 1917-1918
- Periods of service218 days in New Zealand and two years 65 days overseas in Western Europe. Total service of two years and 283 days
- Returned to New Zealandaboard Remuera, 22 October 1918.
- Discharged17 February 1919, being no longer physically fit for war service (emphysema)
- AwardedBritish War Medal and Victory Medal