MUYSER (Guy DE)
- Born on 20 June 1926 in Wiltz (L), died on 19 August 2024 in Luxembourg
- Nationality: Luxembourgish
- Legation Attaché in the Political Affairs section of the Luxembourg Foreign Ministry (1956–1957)
- Legation Secretary in the Political Affairs section of the Luxembourg Foreign Ministry (1958–1960)
- Legation Secretary in the International Economic Relations section of the Luxembourg Foreign Ministry (1961–1963)
- Legation Counsellor in the International Economic Relations section of the Luxembourg Foreign Ministry, then in the International Economic Relations Directorate (1964–1969)
- Legation Counsellor in the Political Affairs Directorate of the Luxembourg Foreign Ministry (1969)
- Chairman of the Coordination Committee for the Installation of European Institutions and Agencies (1969–1972)
- Secretary and Head of Cabinet of Grand Duke Jean (1969–1981)
- Marshal of the Grand Ducal Court (1971–1981)
- Ambassador in Moscow for the Soviet Union, Poland, Finland and Mongolia (1981– 1986)
- Ambassador in Brussels for Belgium and Luxembourg Permanent Representative to the North Atlantic Treaty Organisation (NATO) (1986–1991)