Nanni Loy (born Giovanni Loi; 23 October 1925 – 21 August 1995) was an Italian film, theatre and TV director. Specifically, Nanni Loy was Sardinian, and one of several notable Sardinian film makers, including Franco Solinas.

Loy was born in Cagliari, Sardinia: his father was Guglielmo Loy-Donà, a lawyer issue from a distinguished Sardinian-Venetian family, and his mother was the noblewoman Donna Anna Sanjust of the Marquesses of Neoneli. Rosetta Loy, an Italian novelist, is his sister-in-law.