Charles Day
Charles Day may refer to:
- Boots Day, former baseball player
- Charles Day (boot blacking manufacturer), founder of Day and Martins Blacking
- Charles Day (Medal of Honor), American soldier in the American Civil War
- Charles Day (engineer), American engineer and co-founder of Day & Zimmermann
- Charles Day (rower), American rower
- Charlie Day, American actor
- Charles Bernard Day, American judicial nominee
- Charles Dewey Day, Canadian judge
- Charles W. Day, Wisconsin state senator from De Pere, Wisconsin
- Charles Wayne Day, American blues guitarist