"Dear John" is a song written and recorded by the American singer-songwriter Taylor Swift for her third studio album, Speak Now (2010). The title references the Dear John letter, which is a letter written to a man by his romantic partner to inform him that their relationship is over. The lyrics describe a 19-year-old's toxic and inappropriate relationship with an older man. Produced by Swift and Nathan Chapman, "Dear John" is a slow-burning power ballad combining soft rock, electric blues, and country pop; the production incorporates electric guitar licks.

Speak Now is the third studio album by the American singer-songwriter Taylor Swift, released on October 25, 2010, by Big Machine Records. Swift wrote the album entirely herself within two years while touring to promote her second studio album, Fearless (2008), to reflect on her transition from adolescence into adulthood.