St John's Cathedral is a heritage-listed, Anglican cathedral in Parramatta, a suburb of Sydney, Australia. It has a federal heritage listing as well as a New South Wales state heritage listing.
St John's Cathedral was built in 1803 and is the oldest church in Parramatta. While the present building is not the first on the site, the towers were built during the time of Governor Macquarie, and were based on those of the church at Reculver, England, at the suggestion of his wife, Elizabeth.
The historic St John's Cemetery is located nearby on O'Connell Street. It is the oldest existing European burial ground in Australia. The first internment took place on January 31, 1790, when James Magee, a convict's child, was buried there. The cemetery has a state heritage listing.