Blackstrap Lake is a man-made reservoir in central Saskatchewan, Canada, south of Saskatoon in the Rural Municipality of Dundurn No. 314. The lake was created as a reservoir in 1967, as part of the Saskatoon South East Water Supply System. Blackstrap Lake has an area of 1,200 ha and is generally used to support irrigation, and the industrial and municipal water supply.

The Rural Municipality of Dundurn No. 314 is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 11 and SARM Division No. 5. It is located in the north-central portion of the province along the South Saskatchewan River and surrounds the Town of Dundurn.