"I Don't Wanna Live Forever", alternatively titled "I Don't Wanna Live Forever (Fifty Shades Darker)", is a song recorded by British singer-songwriter Zayn and American singer-songwriter Taylor Swift for the soundtrack to the 2017 film Fifty Shades Darker. It was written by Swift, Sam Dew and Jack Antonoff, and produced by the latter. The single was released on December 9, 2016 by Universal Music Group. The music video was released on January 27, 2017.

The entire song's writing and composition has been thoroughly based on situations of the film. "I Don't Wanna Live Forever" is an electro-R&B ballad. On the track, the pair trade "romantic overtures", while Zayn uses a falsetto on parts of the song, and Swift ponders what the relationship means.

"I Don't Wanna Live Forever" is written in the key of A minor and moves at a tempo of 118 beats per minute in common time. The song follows a chord progression of F–C–G–Am–F–C–G–G♯dim–Am, and the vocals span two octaves, from E₃ to E₅.

Nolan Feenery of Entertainment Weekly gave it a B+ rating. Welcome to Taylor Swift’s Sexy Side." He also praised the vocals of both artists. Lucas Villa of AXS thought the song was not as sexy as Ellie Goulding's "Love Me Like You Do" or The Weeknd's "Earned It", writing, "Despite the neutered lyricism, Zayn saves the day and manages to maneuver his most magnificent performance to date."

The song upon release was available only on iTunes and Tidal. It was not serviced on Spotify upon launch but was later added the following week. In the United States, it sold 188,000 in its first week, in addition to a 25 million radio audience and 3 million streams. It debuted at number 6 on the Billboard Hot 100. It is Zayn's second top 10 solo single and Taylor Swift's 20th top 10, making her the 16th artist and sixth woman to do so. It debuted at number-one on the Digital Songs chart, as Zayn's fourth song (second solo song) and Swift's 11th song to top the chart, tying Swift with Katy Perry for the second-most in the chart's history, behind Rihanna. It is also Zayn's second number-one on the Digital Songs chart in 2016, making him one of only two artists to top the chart with two songs that year, along with Drake. The song later reached a new peak of number 2 on the Hot 100, with 109 million radio audience and 25.7 million streams, becoming Zayn's second top 5 single (as solo artist), Swift's 11th top 5 single, and the highest-charting Fifty Shades single.

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