"Fidelity" is an alternative pop song from singer-songwriter Regina Spektor released in the fall of 2006 in the album Begin to Hope. It marked Spektor's first Billboard 100 hit and is her most successful track to date. Despite a release date of September 25th (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 8, 2007.

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