Catholicism was brought to Adelaide for the first time in 1841 by a group of immigrants. Within a year, Rome created the Diocese of Adelaide and the first Catholic church was built in 1845. The present Adelaide Archdiocese, covering 105,000 square kilometers, is presided over by Archbishop Philip Wilson. St. Mary's Church is a recent construction, but a very beautiful one, made of red brick and stone and frequently hosts weddings and other religious ceremonies.

Brougham Place Uniting Church, also known as Congregational Church, was built between 1860 and 1878, including a lecture hall. By 1881 it housed the oldest organ in the area. Near the church grounds you will find Brougham Gardens.

St Peter's Cathedral is the seat of the Bishop of the Anglican Diocese of Adelaide. The cathedral covers nearly 4,000 square meters of land on the corner of Pennington Terrace and King William Road in the suburb of North Adelaide. The south face has similar features to the Cathedral of Notre Dame in Paris, including an ornate rose window above the main entrance which depicts scenes of South Australia and the Bible. In the western tower are eight bells, which are tolled alternately.

In terms of attendance, Holy Trinity Church on North Terrace, is the largest Anglican church in South Australia. It is historically significant in that it contains elements of the earliest Anglican church building in the region. Part of the Adelaide Diocese, it has an increasing number of locally trained staff, particularly trainees of the Ministry Training Strategy and students of the Bible College of South Australia.

St. Francis Xavier's Cathedral has an interesting and symbolic architecture. For Catholics, the sacred number seven is incorporated into the building's architecture, including seven doors, seven gables, seven arches and more. It also has several sculptures inside and outside, each of them depicting a Biblical event. Throughout its history the cathedral has had three organs.

Islam has been accepted in Australia since 1860. Built in 1888, the Central Islamic Mosque is the oldest mosque in Adelaide. It has four minarets from 1903, which have been rebuilt since then. Part of Australian heritage, this building is protected by the government.

St. Nicholas Church, located in the southern part of Adelaide, is one of the few Russian Orthodox churches in the city. Built in the mid-20th century, it has unforgettable Russian architecture, with a white exterior symbolizing purity. This church often hosts traditional wedding ceremonies.