List of Famous people born on October 21st

Colonel Michael Guy Percival Willoughby, 11th Baron Middleton, was a British peer and soldier.

Miki Itō is a Japanese voice actress and narrator who is affiliated with the Office Osawa agency.

Giovanni de' Medici, in full Giovanni di Pierfrancesco de' Medici, later known as il Popolano was an Italian nobleman of the Medici House of Florence. He was the son of Pierfrancesco di Lorenzo de' Medici, and therefore a member of a secondary branch of the family.

Caleb Hillier Parry was an Anglo-Welsh physician credited with the first report of Parry–Romberg syndrome, published in 1815, and one of the earliest descriptions of the exophthalmic goiter, published in 1825.

Giovanni Ludovico of Saluzzo was marquess of Saluzzo in 1528–1529.

Ilaria Latini is an Italian voice actress.

Evelyn John St Loe Strachey was a British Labour politician and writer.