"Fighter" is a song recorded by American singer and songwriter Christina Aguilera for her fourth studio album, Stripped (2002). The song was written by Aguilera and Scott Storch, and produced by the latter. It was released by RCA Records as the third single from Stripped on March 13, 2003. Inspired by Guns N' Roses' song "November Rain", "Fighter" was characterized as a hybrid of rock and R&B that incorporates elements of arena rock and rock and roll. The track sees Aguilera thanking a man who had done wrong to her for making her a "fighter."

"Fighter" received mostly positive reviews from music critics, who praised Aguilera's vocals and the song's empowering lyrics. The single peaked at number 20 on the US Billboard Hot 100 and was certified gold by the Recording Industry Association of America (RIAA). As of September 2014, "Fighter" has sold 1.184 million copies in the United States. Elsewhere, the song reached the top ten of several national music charts, including those in the United Kingdom, Canada, Australia, and the Netherlands.

A music video for "Fighter" was directed by Floria Sigismondi. Aguilera performed the track on three of her major concert tours: Justified and Stripped Tour (2003), The Stripped Tour (2003), and Back to Basics Tour (2006–08). "Fighter" has been covered by several artists, including Jordin Sparks and Darren Criss.

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