Gillies Lake is a lake in Timmins, Ontario, Canada. It was developed by the Conservation Authority as part of its lake rejuvenation project in 1986.

The lake features a 2.5 km (1.6 mi) trail, picnic facilities, interpretive storyboards, public washrooms, a boardwalk, wireless hotspots, a recreation field, a beach, sports field, playground area, and a supervised swimming area with change rooms.

Before Timmins had been built up, the beach used to extend along the northwest shore, drawing hundreds of bathers on hot days

• List of lakes in Ontario