Born in Mantua, he completed his studies in Parma where he graduated in Marketing at the Faculty of Economics and at the same time in singing at the Conservatory. Since 2007 he has participated in the biennium of the Teatro alla Scala Academy under the guidance of Leyla Gencer during which he had the opportunity to perform in concerts and operas (Così fan tutte). He will continue to collaborate with La Scala as Guglielmo ,in Le convenienze teatrali, Alberto ,in L’occasione fa il ladro, Ernesto in Don Pasquale, participated in the Monteverdi Trilogy as Telemaco and Nerone (the latter role performed also at Carnegie Hall), Tempo in Il trionfo del tempo e del disinganno and Nagg in the world premiere of Fin de partie by Kurtag, revived in Amsterdam and soon at the ,Budapest Spring Festival and the Theater de Chatélet.
Thanks to his versatile repertoire, that makes him ,feel at ease from Monteverdi to Mozart, from Belcanto to Verdi, to the 1900s and ,contemporary music, he is a regular guest of Theatres such as La Fenice (Don Giovanni, Così fan tutte, L'elisir d'amore, La traviata, Věc Makropulos, Diary of one who disappeared, Mirandolina, Cefalo e Procri), Maggio Musicale Fiorentino (Dido ,and Aeneas, Apollo in Dafne ,of M. da Galliano, Admeto in Alceste and Tamino in Die Zauberflöte) and in Verona (Aeneas, Tamino e Nemorino at ,Filarmonico and Don Ottavio and Tybalt in Roméo et Juliette in Arena). ,He has been also performing at San Carlo di Napoli (Aureliano in Zenobia in Palmira of Paisiello, Alfredo, Fenton in Falstaff), at Comunale di Bologna (Don Ottavio and Risorgimento! ,by Ferrero), at Massimo di Palermo (Tracolin ,in Le Toreador of Adam), at Petruzzelli di Bari (Fenton), at Lirico of Cagliari (Camille in La vedova allegra), at the Teatri del Circuito Lombardo (Il cappello di paglia di Firenze), at the Festival della Valle d'Itria of Martina Franca (Armida/Traetta and Giulietta e Romeo/Vaccaj) and Rossini of Wilbad (main role in Don Giovanni of Pacini).
Leonardo Cortellazzi has been collaborating with conductors such as Alessandrini, Chailly, Chung, Conlon, Dantone, Fasolis, Matheuz, Mehta, Montanari, Oren, Ranzani, Rustioni and Santi and with stage directors such as Audi, Carsen, Flimm, Hampe, Michieletto, Pizzi, Ronconi, Vick, Wilson. ,
Among his recent and future engagements Nemorino in Muscat and Naples, Don Ottavio in Liège where he returned in the title role of La clemenza di Tito, Carolino in Che originali! of Mayer at Festival Donizetti in Bergamo, Alfredo in Treviso, Admet in Lisboa where he already debuted Percy in Anna Bolena and will be back with Leicester in Maria Stuarda, again Percy at Sidney ,Opera, Un servo in Luci mie traditrici of Sciarrino, Alfredo, Nemorino and Goffredo in Rinaldo and Le baruffe ,at La Fenice, Acis e Galatea in Kiev, Nagg in Fin de Partie in Paris, Oslo and Antwerp, Don Ottavio in Don Giovanni at NNTT in Tokyo, Lucia di Lammermoor at La Scala, Les Contes d’Hoffmann and Adriana Lecouvreur at Opéra de Paris.