"Fix You" is a song by British rock band Coldplay. It was written by all four members of the band for their third studio album, X&Y (2005). It was released on 5 September 2005 as the second single from X&Y and reached number 4 on the UK Singles Chart. The song reached number 18 in the United States Billboard Hot Modern Rock Tracks. Promo singles were released for the UK and US.

The song is a sobering meditation on grief in the face of the death of a loved one; frontman Chris Martin developed the song to comfort his then-wife, actress Gwyneth Paltrow, after her father died. The anthemic track builds around an organ accompanied by piano and acoustic guitar, and develops into a spirited second half with group vocals, drums, and strings. The hopeful message of the song, and its two-part arrangement, was critically acclaimed. The song has been performed at memorials such as by Coldplay at the One Love Manchester benefit concert in 2017. In September 2021, the song was ranked number 392 on Rolling Stone magazine's list of the "500 Greatest Songs of All Time".