St John's Cathedral or the Cathedral Church of St John the Divine is a cathedral of the Scottish Episcopal Church, located in the town of Oban. It is one of the two cathedrals of the Diocese of Argyll and the Isles, and one of the sees of the Bishop of Argyll and the Isles.
St John's Cathedral is surrounded by town buildings and is less well known than the Roman Catholic St Columba's Cathedral, which enjoys a prominent position on the waterfront. It was constructed between 1863 and 1968.
The construction of this cathedral is highly unusual. The interior clearly shows several phases of building, including the (originally temporary) wooden construction used to finish off the roof at the altar end of the church when lack of funds made it impossible to complete the original plans for expansion.