Giacomo Nanni was born in Rome into a family of music lovers who guided him towards the study of piano and violin. After having earned his Master’s degree in singing, in 2023 he was admitted into the 35th edition of the "Alberto Zedda" Rossini Academy in Pesaro and won the third prize at the 14th International Baroque Opera Competition "Pietro Antonio Cesti" in Innsbruck.
In the operatic field he debuted, among others, in the roles of Schaunard in Puccini's La Bohème (Sandnes, Norway), Figaro in Paisiello's Il barbiere di Siviglia (Siena), Guglielmo in Mozart's Così fan tutte (Varese), and Leporello in Mozart’s Don Giovanni (Vicenza and Rome), Bibi - percursor of Leporello - in Melani’s L’Empio punito (Rome and Rieti, DVD for Dynamic), Pallante in Handel's Agrippina (Stockholm), Esau in the world premiere of J. Barber's The Song of the Ladder (Prato), Ben and Mr Gobineau in Menotti’s The Telephone and La Medium (Milan), Vittorio in Rota's I due timidi (Rome and Rieti, CD and DVD for Dynamic), Menippo in M. Panni's Il giudizio di Paride (Rome), Antinoo in Monteverdi's Il ritorno di Ulisse in Patria (Rieti), Saturno in Legrenzi's La divisione del mondo (Kiel), Giove in Fux's Amore e Psiche (Graz), Uberto and Tracollo in Pergolesi’s La serva padrona and Livietta e Tracollo (Saint-Michel and Varese), Walton in Bellini's I Puritani (Paris) and Lord Sidney in Rossini's Il viaggio a Reims (Pesaro).
He collaborated with conductors such as Giacomo Sagripanti (Paris, Théâtre des Champs-Élysées), Francesco Corti (Stockholm, Drottningholm Slottsteater), Alfredo Bernardini (Graz, Schloss Eggenberg), Enrico Saverio Pagano (Milan, Teatro dal Verme), Jonathan Webb (Prato, Chiesa di S. Domenico), Angelo Michele Errico (Siena, Teatro dei Rinnovati), Alessandro Quarta (Theater Kiel and Teatro Flavio Vespasiano), Marcello Panni (Rome, Teatro Palladium), Riccardo Doni (Stresa, Palazzo dei Congressi), Andrea Foti (Pesaro, Teatro Sperimentale), Edmondo Mosè Savio (Vicenza, Teatro Olimpico), and Gabriele Bonolis (Norway, Sandnes Kulturhus).
Also active in the concert field, he participated in the inauguration of the 2022 Stresa Festival, performing as the solo bass in J.S. Bach's "Matthäus-Passion". Furthermore, he collaborated with Enrico Saverio Pagano and his Orchestra Canova and performed at various festivals including Reate Festival, Festival dei Due Mondi in Spoleto, Urbino Musica Antica, "Vesperali" festival in Lugano, and Festival International de Musique in Algiers.