Films:
* The Caiman (2006): This darkly comedic film by Nanni Moretti is considered one of Gassman's best performances.
* The First Beautiful Thing (2010): A touching and funny story about a father and daughter, directed by Paolo Virzì.
* Romanzo Criminale (2005): A gripping gangster film based on the novel of the same name.
* John Carter (2012): A science fiction action film where Gassman plays the role of Dejah Thoris' father, Tal Hajus.
* The Best Offer (2013): A mystery film by Giuseppe Tornatore, alongside Geoffrey Rush.
* Perfect Strangers (2016): A successful comedy that was remade in several countries.
* The Kid (2019): A historical drama where Gassman plays the role of Benito Mussolini.
* The King of Laughter (2019): A comedy directed by Mario Martone, about the famous Neapolitan comedian Totò.
* The Place (2017): A drama where Gassman plays a mysterious man who offers people their biggest desires.
Television:
* The Roman Empire (2005): A historical miniseries based on the Roman Empire.
* R.I.S. - Delitti Imperfetti (2005-2012): A crime drama series where Gassman plays the role of the lead investigator, Lucarelli.
* The Last Supper (2015): A miniseries where Gassman plays the role of a chef who is also a serial killer.
* The Man Who Killed Don Quixote (2018): A film by Terry Gilliam where Gassman plays the role of a fictionalized version of himself.
* The Name of the Rose (2019): A historical miniseries based on the novel of the same name.
* The Young Pope (2016): A television series created by Paolo Sorrentino, where Gassman plays the role of Cardinal Voiello.
* The New Pope (2020): A television series created by Paolo Sorrentino, where Gassman reprises his role as Cardinal Voiello.
This is not an exhaustive list, but it showcases Alessandro Gassman's diverse range and his popularity in both film and television.