Leonardi is an Italian surname. Notable people with the surname include.
Achille Leonardi, 19th century Italian artist
Alessandro Leonardi or Lionardi, Italian renaissance poet
Alvaro Leonardi (1895 - 1955), Italian World War I Sottotenente
Andrea Leonardi, better known as Bratt Sinclaire, Italian musician
Anna Isabella Leonardi (1620-1804), prolific Italian composer
Camillo Leonardi (1451–1550), Italian astronomer and astrologer
Cesare Leonardi (1935–2021), Italian architect
Claudio Leonardi (1926–2010), Italian historian and philologist
Elena Leonardi (born 1995), Italian professional racing cyclist
Elvira Bouyeure () (1906 - 1999), notable Italian fashion designer and couturier
Elvira Rodríguez Leonardi, Argentine politician
Ezio Leonardi (born 1929), Italian politician
Francesco Leonardi, Italian food author and chef of Empress Catherine II of Russia Francesco Leonardi (missionary) (died 1646), Papal missionary who served as an Archbishop of Antivari Giovanni Leonardi (1541–1609), Roman Catholic saint Giulia Leonardi (b. 1987), Italian female former volleyball player Giuseppe Leonardi (born 1996) is an Italian sprinter Gustavo Leonardi (1869–1918), Italian entomologist Juan María Leonardi Villasmil (1947-2014), Italian titular bishop of Lesvi and auxiliary of the Archdiocese of Mérida, Venezuela Lamberto Leonardi (1939–2021), Italian professional football coach Leoncillo Leonardi (1915 – 1968), Italian sculptor Luca Leonardi (b. 1991), Italian freestyle swimmer Marco Leonardi (1971– ), Italian actor Marina Leonardi (born 1970), Italian pianist and composer Matilde Leonardi, Italian neurologist and paediatrician Mauro Leonardi (born 1959), Italian priest, writer and commentator Michelangelo Leonardi, a former Italian racing driver Natascia Cortesi () (1971– ), Swiss cross-country skier Paul Leonardi, professor of Technology Management Pietro Leonardi (b. 1963), Italian businessman, sporting and managing director of Italian association football Priamo Leonardi (1888 - 1984), Italian admiral during World War II Rick Leonardi, American comic book illustrator Salvator Léonardi (1872 – 1938), Italian mandolin virtuoso, teacher and composer Sergio Leonardi (1944– ), Italian singer and actor Silvio Leonardi (1914-1990), Italian politician Tomás Leonardi (born 1987), Argentine rugby union footballer Thomas Leonardi (born 1954), American insurance executive and former Connecticut's Insurance Commissioner Vincenzo Leonardi (ca. 1590 – ca. 1646 Rome), Italian illustrator of natural history Vittorio Leonardi (1977– ), Italian stand-up comedian and actor