The Rooney River is a river in southern Fiordland, New Zealand. It rises in the Kaherekoau Mountains and flows southward into Lake Hauroko.
It was named after John Rooney, who hired out boats and ran a launch and tourist service on the lake from 1908 to about 1912. Mr Rooney gave up a block of land at the lake in 1917.
The valley is mainly formed in Jurassic Hunter Intrusives, mainly diorites, and follows a fault line in its lower reaches.