Grandmaster and/or Grand Master could mean:

• In chess, an International Grandmaster.
• A Grand Master in science fiction.
• The title of the master craftsman leading the organization of a guild or Fraternal organization.
• The title of the leader of a religious order.
• A title to signify some very important or superior talent.
• Grand Master in Freemasonry.
• Some other organisations, such as the Knights Templar, designated their most senior officer as Grand Master.
• Grandmaster Flash, hip-hop DJ.
• The Grandmaster, a fictional character in the Marvel Comics' universe.