Canadian Northern Ontario Railway Federal Bridge, Railway bridge in Ottawa, Canada

The Canadian Northern Ontario Railway Federal Bridge is a steel plate girder railway bridge over the Rideau River, running from the Merivale area to Mooney's Bay in Ottawa. It is owned by Canadian National Railway and carries Via Rail Toronto–Ottawa Corridor passenger trains. Its official designation is Mile 5.8, subdivision Beachburg.

The Canadian Northern Ontario Railway Bridge was authorized by Board of Railway Commissioners order 13668 on 18 May 1911, with plans approved by order 14828 on 20 September 1911. It opened on 3 December 1913 with the Canadian Northern line from Hurdman Junction to Smiths Falls. The crossing lies on the Beachburg Subdivision, now owned by Canadian National Railway.

The bridge's official designation, Mile 5.8 on the Beachburg Subdivision, is the reference railway staff use for this crossing. Trains on the Via Rail Toronto–Ottawa Corridor still pass over it, so the structure remains part of a working passenger route rather than a monument.

The crossing spans the Rideau River between the Merivale and Mooney's Bay areas and can be viewed from nearby riverbanks and walkways. Access to the bridge itself is restricted since it remains an active railway corridor.

The bridge's official railway designation is Mile 5.8, subdivision Beachburg, a mileage reference on the CN Beachburg Subdivision. The line it carries opened on 3 December 1913, running from Hurdman Junction to Smiths Falls.