Fortnight (song)

"Fortnight" is a song by the American singer-songwriter Taylor Swift featuring the American musician Post Malone. It was written by the artists alongside Jack Antonoff, who produced it with Swift. "Fortnight" is a 1980s-inspired synth-pop, downtempo, electropop, adult contemporary, and new wave ballad built around a steady, pulsing synth bassline, concluding with a bridge-like outro blending Swift and Malone's vocal harmonies. The lyrics describe an emotionally impactful romance that lasts for two weeks: a woman in an unhappy marriage rekindles with a married ex-lover, and the two vow to escape to Florida.

Republic Records released "Fortnight" to mainstream radio as the lead single from Swift's eleventh studio album, The Tortured Poets Department, on April 19, 2024. Reviews mostly praised the vocal chemistry between Swift and Malone but were mixed on the production; some reviews deemed it nuanced and catchy, but others described it as dull and derivative. The single peaked atop the Billboard Hot 100 in the United States, the Billboard Global 200 chart, and the charts in Australia, Canada, Malaysia, New Zealand, the Philippines, Singapore, the United Arab Emirates, and the United Kingdom. At the 67th Annual Grammy Awards in 2025, "Fortnight" was nominated for Song of the Year and Record of the Year.

Swift directed the music video for "Fortnight", collaborating with the Mexican cinematographer Rodrigo Prieto. Shot in black-and-white, the video portrays Swift as a mentally deranged patient in Victorian-gothic fashion mourning a past relationship and reliving its memories. It stars Malone as her lover, and the Dead Poets Society co-stars Ethan Hawke and Josh Charles as mad scientists experimenting on her. The video was met with critical praise and garnered a number of accolades, including Best Music Video at the 32nd Camerimage festival, five wins including Video of the Year at the 2024 MTV Video Music Awards, and Best Video at the 2024 MTV Europe Music Awards.