"A Thousand Miles" (originally titled "Interlude") is the debut single written and recorded by American pop singer Vanessa Carlton. Produced by Curtis Schweitzer and Ron Fair, the song was released as the lead single for Carlton's album Be Not Nobody (2002). Her signature song, it became Carlton's breakthrough hit and one of the most popular songs of the year. To date, it remains Carlton's biggest hit in the United States, and her only single to reach the top ten of the Billboard Hot 100. Due to its success, it was featured on the 2002 US compilation album Now That's What I Call Music! 10.

The song had widespread success worldwide, reaching number one in Australia, where it was most successful, the top five in the United States and Ireland, and the top ten in the United Kingdom, France, Italy and the Netherlands.

It has been covered by numerous artists including Icarus the Owl, Victoria Justice, David Archuleta, Terry Crews and the Glee Cast, and has been sampled by T.I. and Cheryl Cole.

"A Thousand Miles" is a piano-driven pop song supported by a string orchestral arrangement. Carlton said that she wrote the song about her grandfather, who had died earlier. She has also called the song "a combination of reality and fantasy. It's about a love that so consumes you that you do anything for it. That's how I felt at that time."

"A Thousand Miles" is written in the key of B major. Carlton wrote the song's piano riff in the summer of 1998 at her parents' house in Philadelphia; her mother, who had been listening to her, said, "Vanessa, that's a hit song." Carlton was unable to finish the song because of a case of writer's block, and did not return to it for several months. While looking for a record label that would sign her, Carlton played the beginning of the song for a record producer, who said, "You have to finish that." She returned to her parents' home and finished it in an hour one evening, naming it "Interlude."

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