After his first experiences on the set at a very young age in films such as Salce's "L'anatra all'arancio" and Monicelli's "Romanzo popolo", alongside his father Ugo, Gian Marco Tognazzi studied at the Rossellini Institute for Cinematography in Rome and at the same time he trained on sets as an assistant director. Then came the roles in the films "Vacanze in America" by Carlo Vanzina (1984), "Sposerò Simon Le Bon" by Carlo Cotti (1985) and "A night at the cemetery" by Lamberto Bava. In 1989 he met Beatrice Bracco, with whom he studied for years, radically changing his interpretative path. In the meantime he also works a lot in the theater. In the 90s he acted in many cinema films such as "Crack" by Giulio Base, "Ultrà" by Ricky Tognazzi, "Teste rasate" by Claudio Fragasso and "I Laureti" by Leonardo Pieraccioni. Paired with Alessandro Gassmann he plays "Uomini senza donne" and "Facciamo fiesta", directed by Angelo Longoni and "Teste di Cocco" by Ugo Fabrizio Giordani. In 1999 he was the protagonist of the film "S.O.S." by Thomas Robsahm, and "Prime luci dell'alba", directed by Lucio Gaudino, in competition at the Berlin Film Festival, for which he was nominated for the Silver Ribbon as Best Actor. In 2002 he was directed by his sister Maria Sole in "Passato prossimo" and in 2005 in "Romanzo criminale" by Michele Placido, which earned him a nomination for the Nastri d'Argento as Best Supporting Actor. He also acts in "Cecenia" by Leonardo Giuliano, in the film "Guido che sfidò le Brigate Rosse" by Giuseppe Ferrara, in "Polvere" by Max D'epiro, "Ex" by Fausto Brizzi and in "Bella addormentata" by Marco Bellocchio. In 2009 he won the Nastro d'Argento as Best Leading Actor for the short film Fuoriuso. At the same time as cinema and theater he also works on many successful television series. In 2016 he was the protagonist of "Il Ministro" by Giorgio Amato and in 2017 he participated in Federico Moccia's film "Non c'è Campo". In 2018 he returned to theaters with "A casa tutti bene" by Gabriele Muccino, for which he won the collective Nastro d'argento for the cast and the Kineo Award for Best Supporting Actor at the 75th Venice Film Festival, and with the film by Massimiliano Bruno "Non ci resta che il crimine". The same year he was on the set of Vincenzo Alfieri's second film "Gli uomini d'oro". In 2019 he is among the protagonists of the comedy "Se mi vuoi bene" by Fausto Brizzi, of the horror-comedy "Sono solo fantasmi" directed by Christian De Sica, of "Ritorno al crimine" by Massimiliano Bruno and "Divorzio a Las Vegas" by Umberto Carteni. In 2020, in the role of Luciano Spalletti he is on the set of the Sky TV series "Speravo de mori prima", based on the biography of Francesco Totti, directed by Luca Ribuoli, then he is in the cast of the film "Ostaggi" directed by Eleonora Ivone and Angelo Longoni, of which he is the protagonist, and of the ensemble comedy "I Cassamortari" directed by Claudio Amendola with Massimo Ghini and Lucia Ocone. In 2021 he returns to the set of Max Bruno's crime trilogy in "C'era una volta il crimine". In 2022 we see him involved in several projects: " Quando " by Walter Veltroni, " Lo Sposo Indeciso " by Giorgio Amato and in the serial version of " Non ci resta che il calcio " by Max Bruno. In 2023 he works as the protagonist of the Swiss crime series "Alter Ego" by E. Bernasconi and R. Ralstom, he is called by Luca Ribuoli for a cameo in the second series of "Call my agent".