Runanga is a small town on the West Coast of the South Island of New Zealand. It is located eight kilometres to the northeast of Greymouth, to the north of the Grey River. Barrytown is further north. State Highway 6 and the Rapahoe Branch railway run through the town. Runanga was formerly a railway junction, with the steep Rewanui Branch diverging from the Rapahoe line until closure in 1985.