The name Charles I is used to refer to numerous persons in history:

• Kings:
  • Charles I of England, Scotland, and Ireland
  • Charles I of France (also known as Charles the Bald)
  • Charles I of Spain (also known as Charles V of the German Empire)
  • Charles I of Romania
  • Charles I of Sicily
  • Charles I of Portugal
• Other:
  • Charles I, Duke of Bourbon
  • Charles I, Duke of Lorraine
  • Charles I, Emperor of Austria (also known as Charles IV, King of Hungary)