Esmond Unwin Butler, (July 13, 1922 - December 18, 1989) was a Canadian diplomat. He was Ambassador Extraordinary and Plenipotentiary to Morocco. Previously, from 1959 to 1985, he was Secretary to the Governor General of Canada.
Born in Wawanesa, Manitoba,[1] he was made an Officer of the Order of Canada in recognition for being "one of the key developers of the Canadian Honours System" in 1986.