The 1945 Army Cadets football team was an American football team that represented the United States Military Academy as an independent. In their fifth season under head coach Earl Blaik, the Cadets compiled a 9–0 record, shut out five of nine opponents (including a 48–0 victory over No. 2 Notre Dame and a 61–0 victory over No. 6 Penn), and outscored all opponents by a total of 412 to 46. Army's 1945 season was part of a 32-game undefeated streak that included the entire 1944, 1945, and 1946 seasons.
In the final AP poll released on December 2, Army was unanimously ranked No. 1 nationally with 1,160 points, more than 200 points ahead of No. 2 Navy. The Cadets repeated as winners of the Dr. Henry L. Williams trophy for the AP national championship.