The American singer-songwriter Taylor Swift has written or co-written every song in her discography, with the exception of several cover songs and two guest features, alongside some songs released by other artists. Swift signed with Sony/ATV Tree publishing house in 2004 to become a professional songwriter.

Pursuing a country music career in Nashville, Swift wrote or co-wrote all 11 tracks on her eponymous debut album, which was released by Big Machine Records in 2006.^[1][2] Swift then released two extended plays, The Taylor Swift Holiday Collection (2007) and Beautiful Eyes (2008).^[3] On her second studio album, Fearless (2008), Swift solely wrote eight tracks and co-wrote the remaining five with Liz Rose who had also worked with her on her debut album.^[4][5] She wrote all 14 tracks of her third studio album, Speak Now (2010), by herself. The album explores mainstream pop and rock styles in addition to the country pop sound of its predecessor.^[6] On her next release, Red (2012), Swift experimented with other pop, rock, electronic, and hip hop styles.^[7] She wrote nine Red tracks by herself and co-wrote with others including Swedish producers Max Martin and Shellback. Martin and Shellback collaborated with her again on her next two studio albums, 1989 (2014) and Reputation (2017), on which Swift also worked with producer Jack Antonoff and recalibrated her musical identity from country to pop.^[8] Antonoff continued collaborating with Swift on her seventh studio album, Lover (2019), which marks her first release after leaving Big Machine for Republic Records; Lover includes three solely-written tracks.^[9]

Swift explored alternative rock and indie folk on the albums Folklore and Evermore; in addition to Antonoff, Aaron Dessner of the National became a key producer and co-writer.^[10] Swift's former partner Joe Alwyn was co-writer and co-producer of select tracks. Since April 2021, Swift has released four re-recorded albums—Fearless (Taylor's Version), Red (Taylor's Version), Speak Now (Taylor's Version) and 1989 (Taylor's Version)—to claim ownership of the masters of her Big Machine-released albums.^[11] Each of the re-recorded albums includes "from the Vault" unreleased songs Swift had written but excluded from the original releases' track lists. One such song, "All Too Well (10 Minute Version)", is the unabridged version of the previously released "All Too Well". Swift continued her collaboration with Antonoff and Dessner on Midnights (2022) and The Tortured Poets Department (2024).^[12] The latter was released as a double album and contains 31 tracks.^[13]

In addition to solo material, Swift has recorded two songs as a featured artist without a writing credit: "Highway Don't Care" (Tim McGraw, 2013) and "Birch" (Big Red Machine, 2021). She has written songs for film soundtracks including Valentine's Day (2010), The Hunger Games (2012), Fifty Shades Darker (2017), Cats (2019), and Where the Crawdads Sing (2022). Some tracks written by Swift were released as standalone singles for her other projects, such as the Christmas single "Christmas Tree Farm" (2019) and the track "Only the Young" (2020) for her documentary Miss Americana. Among tracks she wrote for other artists are "Best Days of Your Life" (Kellie Pickler), "This Is What You Came For" (Calvin Harris featuring Rihanna), and "Better Man" (Little Big Town).