Sir Peter Harold Reginald Marshall KCMG, CVO (30 July 1924 – 10 June 2023) was a British diplomat.
[2][3] After the war, he attended Corpus Christi College, Cambridge, as a choral scholar, earning a degree in economics in 1949.
[2][3] Marshall joined the Diplomatic Service, holding positions in Washington, Baghdad, Bangkok, Geneva, and Paris over his first two decades.
[2][3] He was involved in several organisations, including the Council for Education in World Citizenship, the English-Speaking Union, and St Catherine's Foundation.
[2] Marshall authored Positive Diplomacy, a guide based on his Foreign Office experiences and served as a visiting lecturer at the Diplomatic Academy of London.