Salter Adrian Hayden, OC (May 31, 1896 – January 5, 1987) was a Canadian lawyer and senator.

He was appointed to the Senate in February 1940 by Prime Minister Mackenzie King, representing the senatorial division of Toronto, Ontario.

He sat as a Liberal and was the chairman of the Canadian Senate Standing Committee on Banking, Trade and Commerce.

Along with Senator William Daum Euler, Hayden helped change the law that had prohibited the sale of margarine in Canada.

[3] Of note, this was the Judicial Committee of the Privy Council's (JCPC) last case under the trade and commerce power of the BNA Act, and one of the last six judgements on a Canadian issue.