Grandmaster or Grand Master may refer to:

• Grandmaster Flash, Joseph Saddler (born 1958), hip-hop musician and disc jockey
• Grandmaster Melle Mel, Melvin Glover (born 1961), hip-hop musician
• "Grandmaster Sexay", nickname for professional wrestler Brian Christopher

• Grand Master (Jedi), also known as "Jedi Grand Master", or formally "Grand Master of the Jedi Order"—Order of the Jedi in Star Wars
• Grandmaster (DC Comics), a DC Comics character
• Grandmaster (Marvel Comics), a Marvel Comics character
• "Grandmaster B", a nickname used by Bud Bundy from the TV sitcom Married... with Children
• Grand Master of Witches, a fictional character from the anime Tweeny Witches

• Grandmaster (1972 film), a Soviet drama film
• Grandmaster (2012 film), an Indian film
• The Grandmaster (film), a 2013 Hong Kong film

• Grandmasters (album), an album by DJ Muggs and GZA

• Grand Master (ancient China)
• Grand Master (order), the head of various orders
  • Grand Master of the Knights Hospitaller
  • Grand Master of the Knights Templar
  • Grand Master of the Teutonic Order
  • Grand Master (Masonic)
• Grand Master of Education, Science, and Culture, Francisco Macías Nguema (1924–1979), the first president of Equatorial Guinea

• Grand Master, a rank in competitive shooting within the USPSA and IPSC
• Grand Master, the highest skill ranking in the Tetris: The Grand Master video game series
• Damon Knight Memorial Grand Master Award, awarded by the Science Fiction and Fantasy Writers of America
• Grand Master of Memory, awarded by the World Memory Sports Council

• Grandmaster (chess)
• Grandmaster (martial arts)
• Grandmaster or Master craftsman, a member of a guild
• Grandmaster, the highest skill ranking in the Overwatch video game
• MWA Grand Master Award, awarded by the Mystery Writers of America
• Spectrum Award for Grand Master awarded by Spectrum Fantastic Art
• World Grand Master (bridge), maintained by the World Bridge Federation
• World Horror Convention Grand Master Award, voted by participants in the annual World Horror Convention

• Grand Master (custom car), winner of the 2002 Ridler Award
• Grandmaster, the source for the time reference in Precision Time Protocol

• Grand Wizard