The Longest Day

The Longest Day could refer to:

• D day
• The Longest Day (book), published in 1959 by Cornelius Ryan
• The Longest Day (film), a 1962 war film based on Ryan's book
• The Longest Day (game), a 1980 wargame by Avalon Hill
• "The Longest Day" (song), a 2006 song by Iron Maiden
• The Longest Day (race), a 24-hour sports and touring car endurance race
• The Longest Day (Land of the Lost), an episode of the 1974 series Land of the Lost
• Longest Day, a Doctor Who novel
• Midsummer, the 'longest day' of the year (the one with the most daylight)