Cod Beck is a river in North Yorkshire, England.

The river extends for 20 miles (32 km) from above Cod Beck Reservoir at Osmotherley on the edge of the North York Moors through Thirsk and on to join the River Swale at Topcliffe.

[1] Cod Beck has a long history of flooding Thirsk and a feasibility study completed in April 2005 recommended additional flood defences and upstream storage.

In 2011, a proposed flood defence scheme in Thirsk was cancelled due to the Environment Agency having its budget cut by 41%.

Cod fish are not found in fresh water.