Sir Adam Beck (June 20, 1857 – August 15, 1925) was a Canadian politician and hydroelectricity advocate who founded the Hydro-Electric Power Commission of Ontario.

As a teenager he worked in his father's foundry, and later established a cigar-box manufacturing company in Galt (now Cambridge, Ontario) with his brother William.

With the slogan "Power at Cost" and in Latin, "dona naturae pro populo sunt" ("the gifts of nature are for the public"), he convinced Premier Whitney to create a board of enquiry on the matter, with him as chairman.

The enquiry suggested creating a municipally owned hydroelectric system, funded by the provincial government, and using water from Niagara Falls and other Ontario lakes and rivers.

In 1915, he tried to introduce a network of interurban railways, known provincially as radials (long-distance trolleys) in Ontario under public ownership, but this plan had to be put on hold during World War I.

In the 1919 post-war election, Beck lost his seat to Hugh Stevenson as the United Farmers of Ontario swept the Conservatives out of power.

Beck continued to push his radial railways proposal after World War I, which pitted him against Premier Ernest Drury, with whom he had an antagonistic relationship.

In 1920, Drury created a Royal Commission, chaired by Robert Franklin Sutherland, which concluded that the popularity of automobiles had rendered Beck's proposal obsolete.