"Bleu noir" ("Blue Black") is a 2010 song by French pop musician Mylène Farmer. It is the second single to her eighth studio album Bleu Noir, released in December 2010. The song was written and produced by Moby with lyrics by Farmer, and the music video produced by French film director Olivier Dahan. It was released on 18 April 2011. In France, the song became Farmer's eleventh number-one hit on the singles chart, but quickly dropped.

"Bleu noir" is Farmer's second single produced and written by Moby, following their 2006 single "Slipping Away (Crier la vie)". On 23 January 2011, it was announced that "Bleu Noir" would be the second single of the album, and on 17 March, Universal Music announced on its website that the release was scheduled for 18 April. Remixed versions of the song named 'Jérémy Hills remix' and 'Glam as you radio mix' were respectively sent to the radios on 10 and 31 March. Formats, track listings and covers arts were officially revealed on 24 and 25 March.

Moby, the composer of the song, also released his own version of the track in May, with other lyrics and arrangements, called "The Day" and which was the official lead single of his then forthcoming album Destroyed.. This simultaneous release created a little controversy amongst fans of Farmer, as many of them criticized the fact that he gave the music to the songstress and then reappropriated it for his own album. In an interview published on 18 May 2011 in the Belgian newspaper Le Soir, Moby said he was very embarrassed and deemed the release of "The Day" as a single an "error", since Farmer was disappointed, thinking "it was her song".

Lyrically, the theme's song is a message of hope saying that love is stronger than death. The words 'blue black' in the title refers to the ink and expresses the idea that when a love story ends, writings are the only things to recalls it. According to the author Alice Novak, guitars used in the song are almost similar to the riffs on The Cure's songs.

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