Switzerland was represented at the Eurovision Song Contest 1971 with the song "", composed by , with lyrics by , and performed by Peter, Sue and Marc. The Swiss participating broadcaster, the Swiss Broadcasting Corporation (SRG SSR), internally selected its entry for the contest.
The Swiss Broadcasting Corporation (SRG SSR) held an internal selection on 8 February. The events of the selection are unknown, including the participants who took part. The internal jury ultimately selected Peter, Sue and Marc to compete with the song "", composed by , with lyrics by .
For an unknown reason, "" was withdrawn by Peter, Sue and Marc, with the song last being mentioned in newspapers in 27 February. On the same day, it was first reported that the trio would instead represent Switzerland with the song "", composed by the same songwriters, which was first performed at the ' program on 4 March, with further reports of the song being referred to as the Swiss entry on 6 March and onward.
At the Eurovision Song Contest 1971, held at the Gaiety Theatre in Dublin, the Swiss entry was the fourth entry of the night following and preceding . The Swiss conductor at the contest was . At the close of voting, Switzerland had received 78 points in total; finishing in twelfth place out of eighteen countries.
A new voting system was introduced in this edition, and was used annually until . Each participating broadcaster appointed two jury members, one aged between 16 and 25 and one aged between 26 and 55, with at least 10 years between their ages. They each awarded 1 to 5 points for each song, other than the song of their own country. They cast their votes immediately after each song was performed and the votes were then collected and counted. For the public voting sequence after the interval act, the jury members were shown on the stage's screen with each lifting a signboard with the number between 1 and 5 for each song, as a visual verification of the scores they had awarded earlier. The two Swiss jurors who voted were Daniela Grigioni and Yvonne Borcard.