The Green River is a tributary of the Lillooet River in southwestern British Columbia, Canada. Approximately 25 kilometres in length, it begins at the outflow of Green Lake in Whistler and joins the Lillooet River a couple of kilometres above where the river flows into Lillooet Lake. Its main tributaries are the Soo River and the river-like Rutherford Creek, which is the location of one of only two artificial whitewater kayaking courses in Canada. Just below Rutherford Creek is Nairn Falls.