The Doubtless River is a river of northern Canterbury, New Zealand.

A tributary of the Doubtful River, it rises south of Mount Boscawen and flows southward through the Lake Sumner Forest Park to join that river 2 kilometres (1.2 mi) east of Phantom Flat.

[1] The New Zealand Department of Conservation maintains a backcountry hut near the junction of the Doubtless and Doubtful Rivers.

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