Dark blue can refer to:

• Dark blue (color), a variant of the color blue
• Dark Blue (film), a 2002 film directed by Ron Shelton and starring Kurt Russell
• "Dark Blue" (song), a song by the American piano rock band Jack's Mannequin
• Dark Blue (TV series), a 2009 TV series on TNT
• Dark Blue, the original name of the supergroup Dark New Day
• "Dark Blue" (Voltron Force), the ninth episode of the 2011 television series
• "Dark Blue", a song by No Doubt from the 2000 album Return of Saturn
• The Dark Blue, a 19th-century literary magazine