"Fidelity" is a song by American singer-songwriter Regina Spektor, released as the second single from her fourth album Begin to Hope. The song marked Spektor's first and only Billboard 100 entry and is her most successful track to date. Despite a release date of September 25 (its popular music video was released even earlier), the song did not hit the charts until December. The song was released in the UK as a two-part single on March 12, 2007. The song making it Spektor's highest-charting single across the world.

Spektor wrote the song while watching the movie High Fidelity, which is based on a book by Nick Hornby.

In 2009, the song was used with permission as accompaniment to the video, "Don't divorce us", released by the Courage Campaign against Proposition 8. The video was viewed over 500,000 times in a week. The single was certified gold by the RIAA for sales of 500,000 copies. and single released from her album Begin to Hope which was her most successful single in United States.

The song was also used in Veronica Mars, Brothers & Sisters, A Favorita, Grey's Anatomy, Secret Diary of a Call Girl, 27 Dresses, Love & Other Drugs.

It is directed by Marc Webb. The video features Spektor in a black and white dress in an abstract environment enjoying tea alone. The room and decor are also black and white. As the video progresses, an empty suit is shown, which Spektor converses with as though it were a real companion. Near the end of the video, Spektor drops a heart pendant on the ground, revealing colored dust. A man (played by Scoot McNairy) appears in the suit, and the two then play with the dust, and join hands as the video ends.

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