Marshall Sylvester Carter (September 16, 1909 – February 18, 1993) was a lieutenant general in the United States Army.

Carter served as an aide to General George C. Marshall during Marshall's time as Chief of Staff of the United States Army, Secretary of State, and Secretary of Defense.

While serving as Director of the NSA, Carter testified to a House Appropriations Committee about the 1967 USS Liberty incident.

He was portrayed by Ed Lauter in the film Thirteen Days (2000), based on events occurring during the Cuban Missile Crisis.

[4] Carter died of liver cancer on February 18, 1993, in his home in Colorado Springs[5]