Lake Lila is a 1,400 acre (5.6 km²) Lake in the William C. Whitney Wilderness Area, in the town of Long Lake, in the west-central portion of the Adirondack Park.

Lake Lila is the largest lake in the Adirondack Park whose shoreline is entirely state-owned; it is the twenty-second largest body of water in the park. The southeastern portion of Lake Lila is an extensive wetland drained by the Shingle Shanty Brook, which feeds the lake; the lake is drained by the Beaver River. The lake is bordered by 2,220-foot (680 m) Mount Frederica.

There are 24 primitive campsites, 18 of which are accessible only by boat. Boats must be hand-launched, and motors are not permitted; there is a 0.3-mile (0.48 km) carry from the parking lot to the lake.