List of Famous people born on October 21st

William T. Wiley is an American artist. His practice spans a broad range of media including drawing, painting, sculpture, film, performance, and pinball. At least some of Wiley's work has been referred to as funk art.

Wolfgang Ketterle is a German physicist and professor of physics at the Massachusetts Institute of Technology (MIT). His research has focused on experiments that trap and cool atoms to temperatures close to absolute zero, and he led one of the first groups to realize Bose–Einstein condensation in these systems in 1995. For this achievement, as well as early fundamental studies of condensates, he was awarded the Nobel Prize in Physics in 2001, together with Eric Allin Cornell and Carl Wieman.

Ethan Van der Ryn is an American sound editor.

Ingrid van Houten-Groeneveld was a Dutch astronomer.

Lieutenant-Colonel Sir Claude Edward Marjoribanks Dansey, KCMG, also known as Colonel Z, Haywood, Uncle Claude, and codenamed Z, was the assistant chief of the Secret Intelligence Service known as ACSS, of the British intelligence agency commonly known as MI6, and a member of the London Controlling Section. He began his career in intelligence in 1900, and remained active until his death.