Loughborough Lake, Freshwater lake in South Frontenac and Kingston, Canada.

Loughborough Lake is a lake in Eastern Ontario, mostly in South Frontenac, Frontenac County, with its southern tip in the city of Kingston. It lies in the Great Lakes Basin, is 24 kilometres long and 18.90 square kilometres in area, with many small islands and 119 kilometres of shoreline.

Loughborough Lake lies in the Great Lakes Basin, mostly within South Frontenac in Frontenac County, with its southern tip touching the northern border of the city of Kingston, about 20 kilometres north of Kingston's town centre. It measures 24 kilometres long, covers 18.90 square kilometres and has 119 kilometres of shoreline. Loon Island in the centre of the lake is privately owned by actor Dan Aykroyd.

Loon Island, in the centre of the lake, is privately owned by the Canadian actor Dan Aykroyd, known for his films and for Saturday Night Live. The lake's name comes from Loughborough Township, the historic Frontenac County township in which most of the water body lies. The southern tip reaches the northern border of the city of Kingston.

The lake lies about 20 kilometres north of Kingston's town centre, with its southern tip touching the northern border of the city of Kingston while the rest sits in South Frontenac. Boaters can launch from marinas around the shoreline; the lake runs 24 kilometres long with 119 kilometres of shoreline to explore.

Loon Island, in the centre of the lake, is privately owned by the Canadian actor Dan Aykroyd, known for his work on Saturday Night Live and the Blues Brothers films. Boaters crossing the middle of the lake pass the island without any marker pointing out the owner.