"I Will Survive" is a hit song first performed by American singer Gloria Gaynor, released in October 1978. It was written by Freddie Perren and Dino Fekaris. A top-selling song after its initial release, it has remained a popular disco anthem, as well as being certified platinum by the RIAA.

The song's lyrics describe the narrator's discovery of personal strength following an initially devastating breakup. It received heavy airplay in 1979, reaching number one on the Billboard Hot 100 and on the UK Singles Chart on consecutive weeks. The song is also frequently recalled as a symbol of female strength and as a gay anthem. In 2016, the Library of Congress deemed Gaynor's original recording to be "culturally, historically, or artistically significant" and selected it for preservation in the National Recording Registry.

Originally released as the B-side to a cover version of the Righteous Brothers song "Substitute", "I Will Survive" became a worldwide hit for Gaynor when disc jockeys played that side of the record instead. "Substitute" appeared on the Billboard Bubbling Under the Hot 100 chart for four weeks in October–November 1978, peaking at No. 107. "I Will Survive" then entered the Billboard Hot 100 in December and reached No. 1 on the chart in March 1979.

As a disco number, the song was unique for its time by virtue of Gaynor's having no background singers. And, unlike her first disco hits, the track was not pitched up to make it faster and to render Gaynor's recorded voice in a higher register than that in which she actually sang. Most disco hits at the time were heavily produced, with multiple voices, overdubs, and adjustments to pitch and speed. "I Will Survive" had a much more spare and "clean" sound.

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