"Oui mais... non" (English: "Yes But... No") is a 2010 song by French pop musician Mylène Farmer. It is the leading single to her eighth studio album Bleu Noir, released in December 2010. The single was released to radio stations on 29 September, then available for pre-order on 11 October in the digital music market, and on 29 November in CD single. The lyrics written by Farmer and the music composed by RedOne. Unlike all of her previous tracks, Laurent Boutonnat was not involved in the song's production or composition.

On 28 September 2010, NRJ issued a press release announcing that "Oui mais... non" would be aired the next day on the radio, at 7.30 a.m. It also revealed the name of the composer and producer and said that this single would be the first single of Farmer's new album. Immediately, many newspapers, including Le Parisien,Ouest France and , published the information, and many Internet sites did it also. The next day, the recording company Universal Music said the single would be released first digitally on 11 October. On 22 October, physical formats with remixes by Tomer G, Klaas and Chew Fu were scheduled to be released on 29 November.

In an interview, RedOne explained why he had decided to compose for Farmer, stating: "I've always been a fan of Mylène Farmer. It's like a legend to me. And when Pascal Nègre called me if I wanted to work with her, I said: "Absolutely! I am a big fan!""

According to Pascal Nègre, the music video will be available in early November. The music video premiered on the temporary website for the album on 16 November 2010. The video is directed by Chris Sweeney. In it, the singer appeared dressed in shiny black leather with a crucifix around her neck, and is surrounded by dancers performing a choreographed dance. Many critics consider that this video is inspired by the music videos for "Bad Romance" and "Alejandro" by Lady Gaga.

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