The Eurovision Song Contest 1966 was the 11th edition of the annual Eurovision Song Contest. It took place in Luxembourg City, Luxembourg, following the country's victory at the 1965 contest with the song "Poupée de cire, poupée de son" by France Gall. Organised by the European Broadcasting Union (EBU) and host broadcaster Compagnie Luxembourgeoise de Télédiffusion (CLT), the contest was held at the Villa Louvigny on 5 March 1966 and was hosted by Luxembourgish television presenter Josiane Chen.

The Eurovision Song Contest, often known simply as Eurovision or by its initialism ESC, is an international song competition organised annually by the European Broadcasting Union. Each participating country submits an original song to be performed live and transmitted to national broadcasters via the Eurovision and Euroradio networks, with competing countries then casting votes for the other countries' songs to determine a winner.