Rex Armistead (February 23, 1930 – December 24, 2013) was a private detective, Mississippi Highway Patrol officer, and the leading operative for the since disbanded Mississippi State Sovereignty Commission. Later, he was heavily involved as an investigator for the Arkansas Project, a co-ordinated attempt in the 1990s to investigate then U.S. President Bill Clinton. The project was funded by conservative media billionaire Richard Mellon Scaife.