"Marie-Blanche" was the French entry to the Eurovision Song Contest of 1970. It was performed in French by Guy Bonnet, who already made his debut in the Contest in 1968 when he co-wrote the lyrics to Isabelle Aubret's " La source".
"Marie-Blanche" was performed sixth on the contest night (following Belgium's Jean Vallée with " Viens l'oublier" and preceding the United Kingdom's Mary Hopkin with " Knock, Knock Who's There?"). At the close of voting, the song had received 8 points, placing 4th in a field of 12.
The song is a ballad, with Bonnet singing about the wonder of the world when the title character (his lover) is with him. Bonnet also recorded the song in Italian under the same title.
"Marie-Blanche" was succeeded by " Un jardin sur la terre" (performed by Serge Lama) in representing France at the Contest. Guy Bonnet returned to the Contest in 1983, singing " Vivre".