The North Esk River is a river in Tasmania, Australia. It is one of the tributaries of the Tamar River together with the South Esk River. It starts in the Northallerton Valley below Ben Nevis in the states North East, joining with the St Patricks River before flowing through Launceston. Launceston's Old Seaport tourist feature is located on the North Esk River. The river becomes tidal downstream of Hoblers Bridge to where it meets the Tamar.