Marquis has many different meanings:

• Don Marquis was a writer, poet, and journalist.
• Marquis Who’s Who is a biographical publisher.
• Marquis des Baux is a small village in southern France.
• Marquis reagent is used as a simple spot-test to identify alkaloids.
• The French spelling of the title known in English as Marquess. Also an archaic spelling in English of the same.
• Marquis is the title of a fetish magazine.
• The following people are best known by this spelling of their title:
  • Marquis de Sade
  • Marquis of Pombal
  • Marquis de Condorcet
  • Marquis de la Fayette
  • Marquis de Custine
  • Marquis de Carabas
  • Marquis de Louvois
  • Marquis of Beixiang of Han China
  • Marquis de Laplace Pierre Simon
  • Marquis de Montcalm
  • Marquis of Granby