Cathedral Marina is a marina on the River Great Ouse at Ely, operated by Ely Marine Ltd. It sits along the riverbank in the city, positioned north of the town centre and close to the iconic Ely Cathedral, which provides a striking backdrop from the water.

The marina offers berths and moorings for boat owners, along with brokerage and survey services for those buying or selling vessels.

It is a recognised landmark on this stretch of the Great Ouse, noted by boaters navigating the river between Ely's various moorings and the nearby Babylon Marina further along the waterway.