The following lists events that happened during 1975 in the Grand Duchy of Luxembourg.
Incumbents
Events
January – March
6 February - A law is passed legalising divorce by mutual consent. 22 March – Representing Luxembourg, Geraldine Branigan finishes fifth in the Eurovision Song Contest 1975 with the song Toi.
April – June
July – September
21 July - Annette Schwall-Lacroix is appointed to the Council of State. 16 September - Prime Minister Gaston Thorn is appointed President of the United Nations General Assembly.
October – December
Unknown
Gross domestic product falls by 6.1%, mostly due to a collapse in the steel price.