Christopher Walton Cooper (born July 9, 1951) is an American actor. He has appeared in supporting performances in several major Hollywood films, including American Beauty (1999), October Sky (1999), The Bourne Identity (2002), Seabiscuit (2003), Capote (2005), Syriana (2005), The Kingdom (2007), Where the Wild Things Are (2009), The Town (2010), The Muppets (2011), Cars 3 (2017), A Beautiful Day in the Neighborhood (2019), and Little Women (2019). He also portrayed Sheriff July Johnson in the acclaimed miniseries Lonesome Dove, which became one of the most successful Westerns in history.

Cooper won both the Academy Award and Golden Globe Award for Best Supporting Actor for his role as John Laroche in the 2002 film Adaptation. He played a lead role in the historical and political thriller Breach (2007), playing FBI agent and traitor Robert Hanssen. He played Daniel Sloan in the 2012 political thriller The Company You Keep, and supervillain Norman Osborn in The Amazing Spider-Man 2 (2014). He also portrayed Al Templeton on the 2016 Hulu miniseries 11.22.63.