"Midnight Blue" is a song by American rock singer-songwriter Lou Gramm, issued as a 7" single in the United States in January 1987 by Atlantic Records. It was the lead-off single from Gramm's debut album, Ready or Not, released in February 1987. An extended remix of the song was available as a 12" single.
In a contemporary review, Cash Box praised the single as being "riveting" and "triumphant." Bret Adams has described "Midnight Blue" as "a terrific pop/rock song" on AllMusic. He has claimed that "despite its hit status, it's one of the decade's truly underappreciated singles". Stephen Thomas Erlewine, while reviewing the Foreigner retrospective collection Jukebox Heroes: The Foreigner Anthology (2000), has called the song "the last great single of the album-rock era".
The single peaked at number 5 on the US Billboard Hot 100 and spent five weeks on the top of the Mainstream Rock chart, starting on 14 February 1987. "Midnight Blue" has remained Gramm's highest-charting solo hit to date.