Sir Francis Aimé Vallat, GBE, KCMG, QC (25 May 1912 – 6 April 2008) was a British international lawyer.
[2] During World War II, Vallat served with the Royal Air Force Volunteer Reserve.
Upon being demobilized in 1945, he joined the Foreign Office as an assistant legal adviser.
In 1960, he succeeded to Sir Gerald Fitzmaurice as Legal Adviser to the Foreign Office, serving in that position until 1968.
Between 1973 and 1981 he was a member of the United Nations International Law Commission, and was its chair between 1977 and 1978.