"Fuck You" (stylized as "Fuck You!" or "F**k You!"), also titled "Forget You" or "FU" for the clean versions, is a song by American recording artist CeeLo Green. It was written by Green, Bruno Mars, The Smeezingtons, and Brody Brown, and produced by The Smeezingtons. It was released on August 19, 2010 as the first single from Green's third studio album, The Lady Killer (2010). "Fuck You" received positive reviews from music critics, and was an international commercial success, making the top-10 in thirteen countries, including topping charts in the United Kingdom, and number two on the Billboard Hot 100.

In an interview with NME, Green revealed that the song is actually aimed at the music industry itself.

Several versions of "Fuck You" have been released. The version of the song edited to remove swearing, which is broadcast in the music video on UK television stations, and played on US radio, is called "Forget You", while the UK radio edit is entitled "FU". All three versions differ in lyrical content, with "Fuck You" being completely uncensored, "Forget You" replacing the swearing with sound effects, and "FU" replacing them by editing them out completely and leaving blank spaces. All three versions can be found on iTunes and both "Fuck You" and "Forget You" are included in an extended play, which features the music video and lyric video, and was released on August 19, 2010, whereas "FU" did not appear in the store until September 21.

A fourth version of the song, featuring American rapper 50 Cent, was released to iTunes in March 2011. The version was entitled "Fuck You (Heartbreaker)!", and was released only in America. The video for this version of the song incorporates scenes from the original video with extra shots of 50 Cent performing. Cee Lo performed a remix of the song, featuring an all-female backing band named "Scarlet Fever", on the The Colbert Report on November 9, 2010. The remix was entitled "Fuck You (Fox News)". The first full verse of the song was a satirical parody of Fox News Channel controversies. A fifth version of the song, entitled "Thank You", was released on May 9, 2011. The song was re-written with new lyrics as a tribute to firefighters. The lyrics mention that Cee Lo's mother was a firefighter. A new version of the video was released with scenes of Cee Lo visiting a fire station.

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