Renato Castellani (4 September 1913 – 28 December 1985) was an Italian film director and screenwriter.

Son of a representative of Kodak, he was born in Varigotti, at the time a hamlet of Final Pia, which became Finale Ligure (Savona) in 1927, where his mother had returned from Argentina to give birth to his son. He spent his childhood in Argentina, in the city of Rosario. After 12 years, he returned to Liguria and resumed his studies in Genoa. He moved to Milan, where he graduated from the Polytechnic University in architecture. In Milan he met Livio Castiglioni and together they aired for GUF (Fascist University Group) L'ora radiofonica and La fontana malata by Aldo Palazzeschi, experimenting with new techniques for sound editing on radio.