Belgium was represented at the Eurovision Song Contest 1966 with the song "", composed by Paul Quintens, with lyrics by Phil van Cauwenbergh, and performed by Tonia. The Belgian participating broadcaster, French-speaking (RTB), selected its entry through a national final, after having previously selected the performer internally.
French-speaking broadcaster (RTB) internally selected Tonia to represent Belgium in the Eurovision Song Contest 1966. RTB asked her to represent Belgium in 1966 during the Knokke Cup in July 1965.
====== was the national final format developed by RTB in order to select the Belgian entry for the Eurovision Song Contest 1966. The competition was held on 25 January 1966 and was broadcast on RTB.
Following announcement of Tonia as Belgian representative, song submission period was opened where composers were able to submit their songs. A professional jury along with Tonia shortlisted eight songs from 163 received songs, which were then whittled down to four for the contest.
The final was held on 25 January 1966 from 20:30 to 21:10 CET, hosted by Jean-Claude Mennessier. Four songs competed in the contest with the winner being decided upon by public postcard voting.
The contest was broadcast on RTB, BRT and radio station .
On the evening of the final Tonia performed 3rd in the running order, following and preceding . Each national jury awarded 5-3-1 point(s) to their top three songs, and at the close of the voting "" had received 14 points (5 from and the , 3 from , and 1 from ), placing Belgium joint 4th (with ) of the 18 competing entries. This was Belgium's highest Eurovision finish to date, and would remain so until Jean Vallée's second place in 1978. The Belgian jury awarded its 5 points to contest winners .