Black Day may refer to
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Black Day (South Korea)
Black Day () is an unofficial holiday observed on April 14 each year. It is mostly observed in South Korea by singles. The day is intentionally contrasted to Valentine's Day and White Day, which are both on the 14th day of their respective month ...
, an informal holiday in South Korea
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Black Day of the Indiana General Assembly, an 1887 event in Indiana, United States
See also
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