William Thomas Medley (born September 19, 1940 in Santa Ana, California) is an American singer and songwriter, best known as one half of The Righteous Brothers singing duo.

Medley met his singing partner Bobby Hatfield while attending California State University, Long Beach. The pair began singing as a duo in 1962. Their first single was "Little Latin Lupe Lu"; their first hit was "You've Lost That Lovin' Feelin'", produced by Phil Spector in 1964. Follow-up hits included "(You're My) Soul and Inspiration" and "Unchained Melody".

The duo broke up in 1968, but returned with another hit in 1974, "Rock And Roll Heaven", and they continued to appear together until Hatfield's death in November 2003. The Righteous Brothers were inducted into the Rock and Roll Hall of Fame in March 2003 by one of their biggest fans, Billy Joel.

Medley also had a moderately successful solo career. In 1987 his duet with Jennifer Warnes, "(I've Had) The Time of My Life", was included on the Dirty Dancing motion picture soundtrack album and the single reached #1 on the Billboard Hot 100. The song also won a 1988 Grammy Award for Best Pop Performance by a Duo or Group with Vocal and an Academy Award for Best Original Song.