The Eurovision Song Contest 1973 was the 18th edition of the annual Eurovision Song Contest. It took place in Luxembourg City, Luxembourg, following the country's victory at the 1972 contest with the song "Après toi" by Vicky Leandros. Organised by the European Broadcasting Union (EBU) and host broadcaster Compagnie Luxembourgeoise de Télédiffusion (CLT), the contest was held at the Grand Théâtre on 7 April 1973 and was hosted by German television presenter Helga Guitton.

The Grand Théâtre de Luxembourg, inaugurated in 1964 as the Théâtre Municipal de la Ville de Luxembourg is the city's major venue for drama, opera and ballet. It underwent renovation work in 2002–2003 resulting in substantial improvements to the stage technology, acoustics and lighting facilities.