Leslie William Coffelt (August 15, 1910 – November 1, 1950) was an officer of the White House Police, a branch of the Secret Service, who was killed while successfully defending U.S. President Harry S. Truman against an attempted assassination on November 1, 1950, at Blair House, where the president was living during renovations at the White House. Acknowledging the importance of the question of Puerto Rico's status, Truman authorized a referendum in Puerto Rico in 1952 to determine its relationship to the U.S.