The Conspirator is a 2010 American mystery historical drama film directed by Robert Redford and based on an original screenplay by James D. Solomon. It is the debut film of the American Film Company. The film tells the story of Mary Surratt, the only female conspirator charged in the Abraham Lincoln assassination and the first woman to be executed by the US federal government. It stars Robin Wright as Mary Surratt, together with James McAvoy, Justin Long, Evan Rachel Wood, Jonathan Groff, Tom Wilkinson, Alexis Bledel, Kevin Kline, John Cullum, Toby Kebbell, and James Badge Dale.

Mary Elizabeth Jenkins Surratt was an American boarding house owner in Washington, D.C., who was convicted of taking part in the conspiracy which led to the assassination of U.S. President Abraham Lincoln in 1865. Sentenced to death, she was hanged and became the first woman executed by the U.S. federal government. She maintained her innocence until her death, and the case against her was and remains controversial. Surratt was the mother of John Surratt, who was later tried in the conspiracy, but was not convicted.