The Barrow is a river in Ireland. It is one of The Three Sisters; the other two being the River Suir and the River Nore. The Barrow is the longest of the three rivers, and at 192 km, the second-longest river in Ireland, behind the River Shannon.

It is said that walking in the Barrow valley is like walking in a constable painting. Riverside walks, ancient Viking and Anglo-Norman settlements dot the landscape and the impressive viaduct in Borris leads you to the enchanting Blackstairs Mountains.