Switzerland was represented by Mariella Farré, with the song Io cosi non ci sto at the 1983 Eurovision Song Contest which took place on April 23. Farré was the winner of the Swiss national final for the 1983 Contest, held on March 26.

Swiss German broadcaster SF DRS was in charge of broadcasting the selection for the Swiss entry for the 1983 Contest. The national final was held at the studio's of DRS in Zurich, hosted by Marie-Thérèse Gwerder. Nine songs were submitted for the 1983 national final and the winning song was submitted by 3 regional juries, a press jury, and a jury of music experts.

DRS and TSI announced their votes in a different order than usual due to technical difficulties.

On the night of the Contest, Farré performed eighth, following Spain and preceding Finland. At the close of voting "Io cosi non ci sto" had received 28 points (the highest score was seven points by Italy and Yugoslavia) placing Switzerland in 15th place out of 20 entries, the contry's worst placing since 1974. The Swiss jury awarded its 12 points to the Netherlands.

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