St Andrew's Cathedral (Scottish Gaelic: Cathair-eaglais Naomh Anndra), or the Cathedral Church of Saint Andrew, is a cathedral of the Scottish Episcopal Church situated in the Scottish city of Aberdeen. It is the see of the Bishop of Aberdeen and Orkney who is the Ordinary of the Diocese of Aberdeen and Orkney.

The cathedral is known as being the church where the first bishop of the Episcopal Church in the United States of America, Samuel Seabury was ordained in 1784. Bishop Seabury was consecrated to the episcopate in "an upper room" of the home of John Skinner, then leader of the St. Andrew's congregation, approx 500 meters from the present building. The approximate site of the house used to be marked by a polished granite tablet on the wall of the former Marischal College. This has, in recent years, been moved.