"Fifteen" is a country pop song performed by American singer-songwriter Taylor Swift. Swift self-penned the song and co-produced it along with Nathan Chapman. "Fifteen" was released on August 30, 2009 by Big Machine Records, as the fourth single from Swift's second studio album, Fearless (2008). The song was inspired by Swift's freshman year of high school at Hendersonville High School, where she first encountered heartbreak, along with her best friend Abigail Anderson. After writing it, Swift asked Anderson for authorization to record the song (due to personal references in the song); Anderson affirmed and it was ultimately included on Fearless. "Fifteen" is a ballad, which has Swift reminiscing on events that occurred to her and her best friend at the age of 15 and cautioning teenagers to not fall in love easily.

"Fifteen" peaked at number 23 on the Billboard Hot 100 and sold over a million digital downloads in the United States. The music video for "Fifteen" was directed by Roman White. It was filmed using a green screen and is heavily accentuated with special effects. The video features Swift walking through a garden, where she relives many memories with Anderson. It received a nomination for the Best Female Video category at the 2010 MTV Video Music Awards, but lost to Lady Gaga's "Bad Romance". "Fifteen" was promoted with live performances, including many that were part of Swift's first and second headlining tours, the Fearless Tour (2009—10) and the Speak Now World Tour (2011–12). Swift partnered with electronics retailer Best Buy for @15, a program that allowed teens to help decide how funds would be distributed among various charities.

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