Michael Day
Michael or Mike Day may refer to:
- Michael Day (guitarist), American guitarist
- Michael Day (cricketer), Australian cricketer
- Mike Day (darts player), New Zealand darts player
- Mike Day (cyclist), American bicycle motocross racer
- Michael S. Day, member of the Massachusetts House of Representatives
- Michael Day (paleoanthropologist), British anatomist and paleoanthropologist
- Mikey Day, American comedian
- Mike Day (filmmaker), Scottish documentarian and cinematographer