"You've Lost That Lovin' Feelin'" is a song by Phil Spector, Barry Mann, and Cynthia Weil, first recorded in 1964 by the American vocal duo the Righteous Brothers. This version, produced by Spector, is cited by some music critics as the ultimate expression and illustration of his Wall of Sound recording technique. The record was a critical and commercial success on its release, reaching number one in early February 1965 in both the United States and the United Kingdom. The single ranked No. 5 in Billboard's year-end Top 100 of 1965 Hot 100 hits – based on combined airplay and sales, and not including three charted weeks in December 1964 – and has entered the UK Top Ten on three occasions.

Harvey Phillip "Phil" Spector was an American record producer and songwriter best known for his innovative recording practices and entrepreneurship in the 1960s and his two trials and conviction for murder in the 2000s. Spector developed the Wall of Sound, a production style that is characterized for its diffusion of tone colors and dense orchestral sound, which he described as a "Wagnerian" approach to rock and roll. He is widely regarded as one of the most influential figures in pop music history and one of the most successful producers of the 1960s.