The Diocese of Sydney is a diocese in Sydney, within the Province of New South Wales of the Anglican Church of Australia. The majority of the diocese is evangelical and low church in tradition.

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.