The Longest Day may refer to:

• The "D-Day" invasion of Normandy during World War II

• The Longest Day (book), 1959 book by Cornelius Ryan
  • The Longest Day (film), a 1962 war film based on Ryan's book
• Japan's Longest Day, a Japanese 1967 war film on the surrender of Japan in World War II
• The Longest Day (game), a 1980 wargame by Avalon Hill
• "The Longest Day" (Land of the Lost), an episode of the 1974 seriesLand of the Lost
• Longest Day (novel), a 1998 novel by Michael Collier set in theDoctor Who universe.
• "The Longest Day", a song by Iron Maiden fromA Matter of Life and Death (2006)
• The Longest Day (album), 1984 album by the Del Fuegos
• "Longest Day", a song by Soulsavers fromThe Light the Dead See (2012)

• The Longest Day (race), a 24-hour sports and touring car endurance race
• "The longest day", a 25-hour day that occurs once a year due todaylight saving time
• Thesummer solstice, the "longest day" of the year since it has the most daylight

• Long Day (disambiguation)

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