Allyn River, a perennial stream^[2] of the Hunter River catchment, is located in the Hunter region of New South Wales, Australia.

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Allyn
Allyn River, surrounded by sub tropical rainforest
Location of the Allyn River mouth in New South Wales
Location
Country	Australia
State	New South Wales
Region	NSW North Coast (IBRA), Hunter
LGA	Dungog
Town	East Gresford
Physical characteristics
Source	Allyn Range, Barrington Tops
• location	near Careys Peak
• coordinates	32°21′42.9″S 151°31′55.668″E
• elevation	655 m (2,149 ft)
Mouth	Paterson River
• location	Vacy
• coordinates	32°3′43.26″S 151°24′57″E
• elevation	15 m (49 ft)
Length	82 km (51 mi)
Basin features
River system	Hunter River catchment
Tributaries
• left	Chads Creek, Stony Creek (Dungog, New South Wales), Lewinsbrook Creek, McIntyre Creek, Mirari Creek
• right	Masseys Creek, Bucks Creek
[1]

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Allyn River rises on Allyn Range, on the slopes of the Gondwana Rainforests Barrington Tops, west of Careys Peak, and flows generally southeast, joined by seven minor tributaries, before reaching its confluence with the Paterson River near Vacy; descending 640 metres (2,100 ft) over its 82-kilometre (51 mi) course.^[1]

The course of the river flows through World Heritage listed high elevation rainforest, noted for its Antarctic Beech; and then through lower elevation subtropical rainforest, including trees such as Red Cedar and Small leaf fig.^[3] Some of the River Oak growing beside the stream are over 50 metres (160 ft) in height. Logging has been practiced in the area since the 1820s.^[3] In the middle course of the river, the geology includes sedimentary rocks such as the Allyn River Member.^[4]

The Allyn River valley is the traditional territory of the Gringai clan of the Wonnarua people,^[5][6] a group of Indigenous Australians.

• List of rivers of Australia
• Rivers of New South Wales