Twin Lakes is a complex of two large lakes in Lake Clark National Park in the U.S. state of Alaska near the northeast corner of Lake and Peninsula Borough. It contains a 6-mile long (9.7 km) upper lake and a smaller 4-mile long (6.5 km) lower lake, joined by a short connecting stream. The lakes outflow westward into the Chilikadrotna River (and eventually into the Mulchatna and Nushagak Rivers and Nushagak Bay).