Balsam Lake (Ontario)

Infobox lake
lake_name = Balsam Lake
image_lake = Kawartha Lakes w legend.png caption_lake = The Kawartha lakes with Balsam Lake (marked 'C')
image_bathymetry =
caption_bathymetry =
location = Ontario
coords = coord|44|35|N|78|50|W|region:CA-ON_type:waterbody|display=inline,title
type =
inflow = Gull River
outflow =
catchment =
basin_countries = Canada
length = 16 km
width =
area =
depth =
max-depth = ft to m|50
volume =
residence_time =
shore =
elevation = m to ft|256.3
islands = Grand Island, Hogg Island, Ball Island
cities = Coboconk

Balsam Lake is a lake located in the Kawartha lakes region of south central Ontario, Canada (coordinates coord|44|35|N|78|50|W|region:CA-ON_type:waterbody). It is 16 km long and averages 3 km wide. The Gull River empties into the lake.

This lake is the highest point of the Trent-Severn Waterway; from here, the waterway descends to Georgian Bay in the northwest, and to Lake Ontario in the southeast. Some claim that Balsam Lake, at 256.3 m (841') above sea level, is the highest point on Earth to which a boat can be navigated from sea level. However, navigable portions of the system formed by the Mississippi River and its tributaries are at elevations of over 305 m (1,000') above sea level.

The village of Coboconk, Ontario is located on the north side of the lake. Balsam Lake Provincial Park is also located on the lake.