Anthony Cecil Eden Quainton (born 4 April 1934 in Seattle) is a former United States diplomat.
He was educated at Princeton University, where he received a B.A. in 1955, and Oxford University, England as a Marshall Scholar, where he received a B.Litt. in 1958. While in England, he married a fellow Marshall Scholar, Susan Long, in 1957. He spend 1958-59 working as a research assistant at St Antony's College, Oxford.
Quainton joined the United States Foreign Service in 1959. As a Foreign Service Officer, he was posted to Sydney 1959-62, to Karachi 1963, to Rawalpindi 1964-66; and to New Delhi 1966-69. He spent 1969-72 at the United States Department of State in Washington, D.C. as the senior political officer for India in the Bureau of Near East and South Asian Affairs. He then spent 1972-73 as a political officer at the U.S. Embassy, Paris. From 1973 through 1976, he was Deputy Chief of Mission in Kathmandu. In 1976, President of the United States Gerald Ford nominated Quainton as United States Ambassador to the Central African Empire. Ambassador Quainton presented his credentials on February 20, 1976 and held this post until June 9, 1978.