Mairehau High School is a state co-educational secondary school in Mairehau, Christchurch, New Zealand. The school takes its name from the suburb Mairehau having been adopted in 1916 as a compliment to Mrs Mairehau Hutton whose father, Arthur Gravenor Rhodes, owned considerable property in the area and was a notable benefactor to the district.
The school is located at the northeast end of the suburb, near to Shirley, thus forming a coeducation alternative to Shirley Boys' High School, and Avonside Girls' High School. Mairehau High School opened on 1 February 1961, having been constructed on the advice of the Department of Statistics.
As of , Mairehau High School has roll of students, of which (%) identify as MÃÂori.
As of , the school has an Equity Index of , placing it amongst schools whose students have socioeconomic barriers to achievement (roughly equivalent to deciles 2 and 3 under the former socio-economic decile system).
Mairehau uses waka groups in place of school houses.
The names and colours of the Mairehau waka groups are: