X-Day

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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