The Soo River is a tributary of the Green River in the Pacific Ranges of the Coast Mountains in British Columbia, Canada, joining that river just north of the Resort Municipality of Whistler. Approximately 35km in length, its origin is on the south flank of the Pemberton Icefield and its course is generally eastward from there to the Green River valley, although upon reaching that valley it runs north for ~3.5km roughly parallel to the Green before joining it.