Gielgud or Giełgud is a Polish surname, a Polonized form of Lithuanian surnames Gelgud, Gelgudas, Gelgauda, or Gelgaudas, associated with the noble family Gelgaudai of the Grand Duchy of Lithuania and Polish-Lithuanian Commonwealth. Notable people with the surname include:Adam Giełgud (1832–1920), Polish-English writer and politician Antoni Giełgud (1792–1831), Polish-Lithuanian brigadier general John Gielgud (1904–2000), English actor, director and producer Lewis Gielgud (1894–1953), English scholar and intelligence officer Maina Gielgud, English ballet dancer and ballet administrator Val Gielgud (1900–1981), English actor, writer, director and broadcaster