D-Day was the day of the Normandy landings on 6 June 1944.
D-Day or D-day may also refer to:
Designation of days D-Day (military term), the day on which a combat attack or operation is to be initiated Economic D-Day, a term used by US President Donald Trump and Treasury Secretary Scott Bessent in August 2026 for a campaign of sanctions and economic isolation against Iran during the 2026 Iran war Decimal Day, the day when the United Kingdom and Ireland decimalised the pound
Film and television Roommates (2006 South Korean film), or D-Day, a horror film D-Day (2013 film), an Indian Hindi-language action thriller film D-Day (TV series), a 2015 South Korean television series
Gaming D-Day (board game), 1961 D-Day (1984 video game) D-Day (ZX Spectrum video game) D-Day (2004 video game) Axis & Allies: D-Day, a 2004 strategy board-game Brothers in Arms: D-Day, a 2006 first-person shooter video game Dino D-Day, a 2011 multiplayer game with dinosaurs added to the war
Literature D-Day: The Battle for Normandy, a 2009 non-fiction book by Antony Beevor "D-Day", a 1995 poem by Pól Ó Muiri Jour J (comics), a French comic book series
Music D-Day (album), by Agust D, 2023 D-Day (D-Lite EP), 2017 D-Day (Kim Dong-han EP), 2018 D-Day (song), a song by Agust D, "D-Day", a 1993 song by duo D-Day, of TommyD and Roger Sanchez "D-Days", a 1981 song by Hazel O'Connor "D-Day", a song by Blondie from the 2011 album Panic of Girls "D-Day", a song by King Gizzard & the Lizard Wizard from the 2017 album Sketches of Brunswick East D-Day: A Gangsta Grillz Mixtape, a 2022 compilation album by Dreamville
See also Oklahoma D-Day, a scenario game of paintball D-Day Dodgers, Allied servicemen who fought in Italy during the Second World War, and a popular wartime song D-Day Daily Telegraph crossword security alarm