Sergio Pierattini (born July 27, 1958, Sondrio, Lombardy, Italy) is an Italian actor and dramaturg who grew up in Siena, where he first trained at the Piccolo Teatro before being admitted to the Accademia Nazionale di Arte Drammatica Silvio D'Amico in Rome in 1979. His teachers included Ruggero Jacobbi, Aldo Trionfo, Anna Miserocchi, and Andrea Camilleri; he graduated in 1982. Since 2005 he has taught radio dramaturgy at the Centro Sperimentale di Cinematografia in Rome, and since 2013 he has been a faculty member in the dramaturgy master's program at the Silvio D'Amico Academy. He has also adapted and directed stage works, including a 2018 theatrical adaptation of Pupi Avati's Regalo di Natale and a 2019 new version of Anfitrione. His most notable film credits include Spider-Man: Far from Home (2019) (Tom Holland, Samuel L. Jackson), The Traitor (2019) (Pierfrancesco Favino, Toni Servillo), Three Floors (2021) (Toni Servillo, Alba Rohrwacher), Only You (1994) (Robert Downey Jr., Marisa Tomei), Feather (2016) (Valerio Mastandrea, Laura Morante), La trattativa (2014) (Sabrina Ferilli, Luca Argentero), Se son rose (2018) (Leonardo Pieraccioni, Claudia Pandolfi), and Golden Men (2019) (Marco Giallini, Claudia Pandolfi). On television he is known for his recurring role as Aloisi in I delitti del BarLume (2013–2025) and for appearances in Lea (2022) and Il clandestino (2024).