List of Famous people born on April 21st

Guido Calza, born in Milan, Italy, was an Italian archaeologist whose work included excavations in Rome and at the port city of Ostia. Calza served as inspector of the Ostia excavations and as the director of excavations in the Forum Romanum and the Palatine Hill in Rome. He also oversaw the excavation of the Isola Sacra Necropolis.

Dario David Hunter, also known as Yisroel Hunter, is an American rabbi, lawyer and politician. He is the first Muslim-born man to be ordained as a rabbi. A former member of the Youngstown, Ohio Board of Education, Hunter sought the 2020 Green Party presidential nomination, ultimately coming in second. He ran as the presidential nominee of the Oregon Progressive Party and elsewhere under the party label of Progressive Party in the 2020 United States presidential election.

Mette Schjoldager is a Danish badminton player from Viby, Roskilde Municipality, on the island of Zealand.

Arnoldus Dick Pijpers is a Dutch football manager, who was the manager of Estonian top tier club Flora in 2018.

Bruno Maderna was an Italian conductor and composer.