9 January - The European Court of Justice building is opened in Kirchberg, Luxembourg City.
4 April – Pierre Werner extends the operating concession to Compagnie Luxembourgeoise de Télédiffusion, now RTL Group, until 31 December 1995.
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.
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
1973 in Luxembourg Wikipedia (Text) CC BY-SA
