Samuel Ellsworth Winslow (April 11, 1862 – July 11, 1940) was an American politician and Republican Congressman from Massachusetts.

[1] Sam captained and coached the 1884–85 Harvard baseball team which accrued a record of 27–1, defeating Yale twice, and compiling a .306 team hitting average while winning the Intercollegiate Base Ball Association championship.

During the summer of 1884, he pitched briefly for the Barnstable town team in what is now the Cape Cod Baseball League.

Winslow was the chairman in the Committee on Interstate and Foreign Commerce during the Sixty-seventh and Sixty-eighth Congresses.

He was appointed by Calvin Coolidge in 1926 as a member of the United States Board of Mediation, for the disposition of disputes between carriers and their employees.