The Anglican Diocese of Bunbury is a diocese of the Anglican Church of Australia which was founded in 1904 and covers the south of the State of Western Australia. Together with Perth and North West Australia, it is one of the three diocese of the Province of Western Australia. The diocese's cathedral since 1962 is St Boniface Cathedral in Bunbury. The current Bishop of Bunbury, since 3 November 2018, is Ian Coutts.

The Anglican Church of Australia, formerly known as the Church of England in Australia and Tasmania, is a Christian church in Australia and an autonomous church of the Anglican Communion. It is the second largest church in Australia after the Catholic Church. According to the 2016 census, 3.1 million Australians identify as Anglicans. As of 2016, the Anglican Church of Australia had more than 3 million nominal members and 437,880 active baptised members. For much of Australian history since the arrival of the First Fleet in January 1788, the church was the largest religious denomination. It remains today one of the largest providers of social welfare services in Australia.