The Porcupine River is a river in the James Bay and Moose River drainage basins in the city of Timmins, Cochrane District in northeastern Ontario, Canada. It flows 32 kilometres (20 mi) from Porcupine Lake to its mouth at Night Hawk Lake, the source of the Frederick House River, a tributary of the Abitibi River.

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Porcupine River
Bridge in Porcupine from Porcupine River
Location of the mouth of the Porcupine River in Ontario
Location
Country	Canada
Province	Ontario
Region	Northeastern Ontario
District	Cochrane
Physical characteristics
Source	Porcupine Lake
• coordinates	48°29′41″N 81°10′30″W
• elevation	277 m (909 ft)
Mouth	Night Hawk Lake
• coordinates	48°31′26″N 81°01′02″W
• elevation	274 m (899 ft)
Length	32 km (20 mi)

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The Porcupine River begins at Porcupine Lake at an elevation of 277 metres (909 ft) and flows northeast under Highway 101 out of the lake at the community of Porcupine between the neighbourhoods of Pottsville and Golden City. It flows northeast, takes in the left tributary North Porcupine River, flows southeast through the neighbourhood of Hoyle and again under Highway 101, and reaches its mouth at the northwest of Night Hawk Lake at an elevation of 274 metres (899 ft).

The Timmins/Porcupine Lake Water Aerodrome is on Porcupine Lake.

• North Porcupine River
• Porcupine Lake
  • Bob's Creek (right)
  • South Porcupine River (right)

• List of rivers of Ontario