List of Famous people born on April 21st

Ira Allen was one of the founders of the U.S. state of Vermont and a leader of the Green Mountain Boys during the American colonial period. He was the younger brother of Ethan Allen.

Mihály Táncsics was a Hungarian writer, teacher, journalist and politician.

Francesco Molin or Francesco Da Molin was the 99th Doge of Venice, reigning from his election on 20 January 1646 until his death. Molin's reign is notable because of Venice's participation in a prolonged war with the Ottoman Empire over Crete; this war was begun during the reign of Molin's predecessor Francesco Erizzo, and dragged on until 1669. To fund the cost of this war, Molin sold access to the Venetian patriciate at a cost of 100,000 ducats per person.

Eero Reino Lehtonen was a Finnish athlete. He competed at the 1920 Olympics in the pentathlon, long jump and decathlon and at the 1924 Olympics in the pentathlon and 4 × 400 m relay. He won the pentathlon at both Games, but performed poorly in other events. He retired after learning that pentathlon was excluded from the 1928 Olympics.