Millard Fillmore Harmon Jr. (January 19, 1888 – February 26, 1945) was a lieutenant general in the United States Army Air Forces during the Pacific campaign in World War II. He was presumed to have perished in February 1945 on a flight when the plane carrying him disappeared in transit. Harmon, Frank Maxwell Andrews, Simon Bolivar Buckner, Jr. and Lesley J. McNair, all lieutenant generals at the time of their deaths, were the highest-ranking Americans to die in World War II.