Lily Lake, Glacial lake in Luzerne County, Pennsylvania.

Lily Lake is a glacial lake in Luzerne County, Pennsylvania, covering roughly 160 acres and sitting at about 1,010 feet in elevation. The water provides space for recreational boating with designated launching areas for visitors.

Lily Lake is a natural glacial lake on Pond Creek, about 1 mile long and 0.5 miles wide. It entered the Geographic Names Information System on August 2, 1979, under identifier 1179343, and also appears as Long Pond in a 1984 street and road map. The Pennsylvania Fish and Boat Commission stocked it with brook, brown and rainbow trout in 1991, and surveyed it in 2013 and again on May 12, 2014 to study alewives and largemouth bass.

Lily Lake is also called Long Pond, a name that appears on Patton's Philadelphia and Suburbs Street and Road Map published in 1984. Anglers fish through the ice in winter and from boats in warmer months, and the lake is listed on the Luzerne County Natural Areas Inventory.

Lily Lake has a single boat launch. Boats longer than 18 feet and engines over 60 horsepower are not permitted. From the Saturday before Memorial Day through September 30, boats must travel at limited speeds between noon and sunset. Ice fishing is also done on the lake.

The lake is home to several fish species including alewives that have shaped the balance of populations in unexpected ways. This natural dynamic shows how introduced species can shift an entire ecosystem.