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X-Day may refer to:
- X-Day (Church of the SubGenius), a festival associated with the Church of the SubGenius
- X-Day (manga), a 2002 manga written by Setona Mizushiro
- March 20, 2003 anti-war protest, a protests against the Iraq War
- The first day of Operation Downfall, the planned Allied invasion of Japan during World War II
- X Day (musical), a musical by Akinori Nakagawa
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