San Leonardo ( or ; ) is a (municipality) in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, located about northwest of Trieste and about east of Udine, and borders the following municipalities: Grimacco, San Pietro al Natisone, Savogna, Stregna, and Prepotto.
San Leonardo localities include: Altana-Utana, Camugna-Kamunja, Cemur-ÃÂemur, Cernizza-ÃÂarnica, Cisgne-ÃÂià ¡nje, Clastra-Hlastra, Cosizza-Kosca, Cravero-Kravar, Crostù-Hrastovije, Dolegna-Dolenjane, Grobbia-Grobje, Iainich-Jagnjed, Iesizza-JesiÃÂje, Iessegna-Jesenje, Merso di Sopra-Gorenja Miersa, Merso di Sotto-Dolenja Miersa, Osgnetto-Oà ¡nije, Ovizza-Ovica, Picig-PiÃÂiÃÂ, Picon-Pikon, Podcravero-Podkravar, Postacco-Puostak, Precot-Prehod, Scrutto-à  krutove, Seuza-Seucè, Ussivizza-Uà ¡iuca, Zabrida-Zabardo, Zamir-Zamier.<br>Municipal hall is located in Merso di Sopra.
89.2% of the population in San Leonardo were Slovenes according to the census 1971.