Leslie Mortimer Shaw (November 2, 1848–March 28, 1932) was an American businessman, lawyer and politician.

Born in Morristown, Vermont, he became a lawyer and banker, and in 1898 became Governor of Iowa, serving until 1902. He then became United States Secretary of the Treasury under President Theodore Roosevelt in 1902, serving until 1907.

He was a candidate for the nomination of the Republican Party during the U.S. presidential election, 1908.

After leaving the Presidential Cabinet and public life he returned to banking, working in New York City.

He died in Washington, D.C. and is buried in Denison, Iowa.