1973 in Luxembourg

January – March

• 9 January - The European Court of Justice building is opened in Kirchberg, Luxembourg City.

April – June

• 4 April – Pierre Werner extends the operating concession to Compagnie Luxembourgeoise de Télédiffusion, now RTL Group, until 31 December 1995.^[2]
• 7 April – Luxembourg City hosts the Eurovision Song Contest 1973 after Vicky Leandros' victory the previous year. Representing Luxembourg, Anne-Marie David successfully defends Luxembourg's title, winning with the song Tu te reconnaîtras.
• 20 June – Ernest Arendt is appointed to the Council of State.^[3]

July – September

October – December

• 9 October – General strike held across Luxembourg.
• October – Cargolux purchases its first jet aircraft, a DC-8 Series 61.

• 29 January - Su-Mei Tse, musician, photographer, sculptor
• 3 March – Xavier Bettel, politician
• 14 November – Marc Meyers, musician

• 14 February – Émile Reuter, politician
• 25 March – Edward Steichen, photographer
• 30 March – William J. Kroll, metallurgist
• 1 May – Jules Mersch, writer
• 17 November – Lou Koster, composer

• Thewes, Guy (2006). Les gouvernements du Grand-Duché de Luxembourg depuis 1848 (PDF) (in French) (2006 ed.). Luxembourg City: Service Information et Presse. ISBN 978-2-87999-156-6. Retrieved 12 December 2009.