Middleton Grange School (abbreviated MGS) in Christchurch, New Zealand, is a state-integrated Christian co-educational Year 1 to 13 school. It's currently New Zealand's largest evangelical Christian school.

Established in 1964 by the Christian Schools Trust, as an independent Christian school and became integrated into the state system in 1996.

Middleton Grange School belongs to the Christchurch Christian Schools Network (CSN) and the New Zealand Association for Christian Schools (NZACS).

The school premises used to house the Christchurch headquarters of the Maxim Institute, a conservative Christian thinktank. Bruce Logan was once Middleton Grange's former curriculum director.

In 2010, the school was ordered to apologise and compensate a former employee for firing him because of his homosexuality.

In 2018, the school held a mufti day for a gold coin donation called 'dress as refugees' to support World Vision. The school asked students to dress as refuges in old ragged cloths. The former principal Richard Vanderpyl said that the mufti say was a good way to develop understanding and compassion is to experience a little bit of what it feels like to be poor. The school received two complaints from parents due to the mufti day.

Middleton Grange School's academic structure consists of four departments, Primary School, Middle School, Senior College and International College.

Primary School consists of students from years 1–6, Middle School consists of students from years 7–10 and Senior College consists of students from years 11–13.