Alessandro Antine Nivola (born June 28, 1972) is an American actor. His best-known roles include Pollux Troy in Face/Off (1997), Henry Crawford in Mansfield Park (1999), Billy Brennan in Jurassic Park III (2001), Arthur "Boy" Capel in Coco Before Chanel (2009), Anthony Amado in American Hustle (2013), Peter Forente in A Most Violent Year (2014), Governor Williams in You Were Never Really Here (2017), Mark Madoff in The Wizard of Lies (2017), photojournalist Lee Berger in the miniseries Chimerica (2019), Dickie Moltisanti in The Many Saints of Newark (2021), Detective Hiltz in Amsterdam (2022), and Detective Conley in Boston Strangler (2023).

He has been married to actress Emily Mortimer since 2003; they have two children.