Martinson's Beach is a hamlet in the Canadian province of Saskatchewan. It is located on the western shore of Jackfish Lake.
In the 2021 Census of Population conducted by Statistics Canada, Martinson's Beach had a population of 49 living in 22 of its 65 total private dwellings, a change of from its 2016 population of 50. With a land area of, it had a population density of in 2021.[1]