"Midnight Blue" is the first single released by Lou Gramm from his debut solo album Ready or Not in 1987. The single spent five weeks at number one on the Billboard Hot Album Rock Tracks, starting on February 14, 1987, and peaked at number five on the Billboard Hot 100, Gramm's highest-charting solo hit.
Stephen Thomas Erlewine of Allmusic calls the song the "last great single of the album-rock era". Allmusic reviewer Bret Adams posits that, "despite its hit status, it's one of the decade's truly underappreciated singles".
The song was covered by R.E.M. on their 1987 tour.