Born in Rimini in February 1971, Giacomo Nanni studied cartooning for three years at the Urbino Book School before publishing, in the magazine Mano in 1996, Six Drawings for a Trip to Grande Garabagne written by Henri Michaux.
In 2005, he won the prize for the best short story at the Lucca Comics Festival for La Plus Belle Chose, which became a chapter in his first book: Le Garçon qui cherchait la peur, published in Italy by Coconino Press, then in France by Cornélius.
In 2006 he won the Nuove strade prize at the Comicon in Naples. He has published other works, such as the Chroniquettes trilogy, whose first volume was published in France (by Cornelius).
In 2015, he published La Véritable Histoire de Lara Canepa (The True Story of Lara Canepa) with Cornelius. In Italy, he published Prima di Adamo with Canicola Edizioni on the occasion of his personal exhibition A Tratti organised at the Academy of Fine Arts in Bologna for the ninth edition of the Bilbolbul International Comics Festival.
En 2019, il publie pour Albin Michel Jeunesse Pour faire une tarte aux pommes, il faut un pépin de pomme, conçu et écrit par Bastien Contraire. Illustrateur, il collabore avec Le Monde, L’Obs, la revue XXI – Vingtetun et d’autres journaux.
In 2020, his book Acte de Dieu, published by Ici Même, received the Prix de l'audace at the Angoulême Festival. The following year, his new book Tout est vrai was also published by Ici Même. He lives and works in Paris.