The Diocese of Auckland is a Latin Church ecclesiastical territory or diocese of the Catholic Church in New Zealand. It was one of two dioceses in the country that were established on 20 June 1848. Auckland became a suffragan diocese of the Archdiocese of Wellington in 1887. A large area of the diocese south of Auckland was split from the diocese on 6 March 1980 to form the Diocese of Hamilton. As of 2021, almost 40 per cent of New Zealand’s 471,000 Catholics lived within the diocese of Auckland.

James Michael Liston was the 7th Roman Catholic Bishop of Auckland, New Zealand.