Saint Andrew's Cathedral is an Anglican cathedral in Singapore. It is located near City Hall, Downtown Core, within the Central Area in Singapore's central business district. It is the cathedral church of the Anglican Diocese of Singapore and serves as the mother church to 27 parishes and more than 55 congregations. The church has existed on the site since 1836, although the current building was constructed in 1856–1861. The logo of the cathedral is the St Andrew's Cross.

The Diocese of Singapore is a diocese of the Province of the Anglican Church in South East Asia consisting of 27 Anglican parishes in Singapore and 6 deaneries throughout the Asia region. It has an established history of church-planting as well as providing educational, medical and social services in Singapore and the neighbouring region. The Diocese of Singapore is in communion with the See of Canterbury. St Andrew's Cathedral is the cathedral church of the diocese.