A Day or A-Day may refer to:
- A Day (film), a 2017 South Korean film
 - A-Day (University of Alabama), an annual college football exhibition game in the United States
 - A-day (6 April 2006), the commencement of pension tax simplification in the United Kingdom
 - "A Day", a 2017 episode of the American Netflix series Love
 
See also
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