Nicholas Day may refer to:
- Saint Nicholas Day, the feast day of St Nicholas
- Nicholas Day (actor) (born 1947), British actor
- Nick Day (statistician) (born 1939), British statistician and cancer epidemiologist
- Nick Day (film director), British born, US-based filmmaker
- Nicolas Day (born 1955), Australian wildlife illustrator
This disambiguation page lists articles about people with the same name.
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