Leonardi is an Italian surname from the forename Leonardo. Notable people with the surname include.
Achille Leonardi (c.1800–1870), 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 Elvira Bouyeure () (1906–1999), Italian fashion designer and couturier Elvira Rodríguez Leonardi, Argentine politician Ezio Leonardi (1929–2025), 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 the Archbishop of Antivari Giovanni Leonardi (1541–1609), Roman Catholic saint Giuseppe Leonardi (born 1996), 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 (born 1991), Italian freestyle swimmer Marco Leonardi (born 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, Italian racing driver Natascia Cortesi () (born 1971), Swiss cross-country skier Oliviero Leonardi (1921–2019), Italian painter and sculptor Paul Leonardi, American professor of Technology Management Pietro Leonardi (born 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 (born 1944), Italian singer and actor Silvio Leonardi (1914–1990), Italian politician Thomas Leonardi (born 1954), American insurance executive and former Connecticut Insurance Commissioner Tomás Leonardi (born 1987), Argentine rugby union footballer Vincenzo Leonardi (ca. 1590 – ca. 1646 Rome), Italian illustrator of natural history Vittorio Leonardi (born 1977), Italian stand-up comedian and actor