Mark Felt: The Man Who Brought Down the White House is a 2017 American biographical political thriller film written and directed by Peter Landesman, and based on the 2006 autobiography of FBI agent Mark Felt, written with John O'Connor. The film depicts how Felt became the anonymous source nicknamed "Deep Throat" for reporters Bob Woodward and Carl Bernstein and helped them in their investigation of the Watergate scandal, which resulted in the resignation of President Richard Nixon.

William Mark Felt Sr. was an American law enforcement officer who worked for the Federal Bureau of Investigation (FBI) from 1942 to 1973 and was known for his role in the Watergate scandal. Felt was an FBI special agent who eventually rose to the position of Deputy Director, the Bureau's second-highest-ranking post. Felt worked in several FBI field offices prior to his promotion to the Bureau's headquarters. In 1980, he was convicted of having violated the civil rights of people thought to be associated with members of the Weather Underground, by ordering FBI agents to break into their homes and search the premises as part of an attempt to prevent bombings. He was ordered to pay a fine, but was pardoned by President Ronald Reagan during his appeal.