The Owenkillew is a fast-flowing spate river in County Tyrone, Northern Ireland, rising in Davagh Forest and flowing approximately 40 kilometres westward toward Newtownstewart. The river is used for white water paddling and is located near Omagh and the village of Gortin. As a spate river, water levels are closely tied to rainfall, and the river is capable of flooding significantly during periods of heavy precipitation, which can make conditions both challenging and potentially dangerous.

Paddlers should be aware of tree blockages, which have been reported as causing significant obstruction on either side of the bank. These should be treated as serious hazards, particularly given the speed of the current. The river's character changes along its length: the upper section is a fast, ultra-oligotrophic upland stream, while the mid-reaches widen and diversify, with trees frequently lining the banks. The lower stretches support stands of remnant woodland.

The Owenkillew is a designated Special Area of Conservation, most notably supporting the largest known population of freshwater pearl mussels in Northern Ireland. Otters, dippers, and kingfishers are present along the river's length, and both Atlantic salmon and brown trout use the river. The presence of these protected species, particularly the freshwater pearl mussel, means paddlers should be mindful of their impact on the riverbed and water quality.

The river has been paddled during winter months, including January, suggesting it holds adequate water levels in the colder, wetter season. The scenery along the route has been described positively by paddlers, with the wooded mid and lower reaches providing visual interest. Gortin village is in the vicinity and offers local amenities.