The 1943 college football season concluded with the Fighting Irish of Notre Dame crowned as the nation's No. 1 team by a majority of the voters in the AP Poll, followed by the Iowa Pre-Flight Seahawks as the runner-up. For the third time in the history of the AP Poll, a team that had lost a game was named mythical national champion; (Minnesota (1936) and Ohio State (1942)). Notre Dame lost its final game of the season, a Chicago contest against the Great Lakes Naval Training Center. Along the way, however, the Fighting Irish had played one of the toughest college schedules ever, beating two No. 2 ranked teams (Michigan and Iowa Pre-Flight) and two No. 3 ranked teams (Navy and Army). Purdue University would seemingly have a claim on the 1943 Championship as well as the only undefeated team playing a full schedule, but the Purdue athletic department has never pursued the claim.
In 1943, as many as 131 sportswriters participated in the AP poll, which included, for the first time, "service teams." Drawn from flight schools and training centers for participants in World War II, the service teams played against the colleges. At the same time, a number of universities suspended their football programs. Alabama, Auburn, Florida, Kentucky, Mississippi, Mississippi State, Tennessee, and Vanderbilt in the Southeastern Conference did not field teams in 1943. In addition, six Pacific Coast Conference teams (Stanford, Oregon, Oregon State, Washington State, Idaho, and Montana) did not play, nor did Boston College, the Citadel, Duquesne, Fordham, Harvard, Michigan State, Syracuse, and William & Mary.
On September 17, Georgia beat Presbyterian College 25–7. The next day, September 18, Michigan won at Camp Grant, 26–0. Wisconsin lost to Marquette, 33–7, on its way to a 1–9–0 finish.
September 25
Ohio State lost to Iowa Pre-Flight 28–13. Michigan beat Western Michigan 57–6. Notre Dame won at Pitt, 42–0.
Army beat Villanova 27–0 and Navy beat North Carolina Pre-Flight, 31–0. Georgia lost at LSU, 34–27. Tulsa beat SMU 20–7, Georgia Tech beat North Carolina 20–7.
October[]
October 2 Michigan won at Northwestern 21–7. Notre Dame beat Georgia Tech 55–13. Army defeated Colgate 42–0 and Navy beat Cornell 46–7. The first AP Poll of the season led off with No. 1 Notre Dame, No. 2 Michigan, No. 3 Army, No. 4 Navy, and No. 5 Duke.
October 9No. 1 Notre Dame beat No. 2 Michigan 35–21 in the first No. 1 vs. No. 2 matchup in the seven-year history of the AP Poll. No. 3 Army registered another shutout, defeating Temple 51–0. In Baltimore, No. 4 Navy edged No. 5 Duke, 14–13. No. 6 Penn edged No. 14 Dartmouth 7–6. No. 7 Purdue went to 4–0–0 with a 19–0 win over Camp Grant. The next AP Poll featured No. 1 Notre Dame, No. 2 Army, No. 3 Navy, No. 4 Penn, and No. 5 Purdue.
October 16No. 1 Notre Dame won at Wisconsin 50–0. No. 2 Army won at Columbia, 52–0. In four games, the Cadets had outscored their opponents 172–0. No. 3 Navy beat Penn State 14–6. No. 4 Penn beat the Lakehurst Naval Air Station 74–6. No. 5 Purdue beat Ohio State 30–7 at a game in Cleveland. Penn and Purdue swapped spots in the next AP Poll, but Notre Dame, Army, and Navy remained the top three.
October 23No. 1 Notre Dame beat Illinois 47–0. No. 2 Army yielded its first points, but won at Yale, 39–7. No. 3 Navy beat Georgia Tech 28–14 in Baltimore. No. 4 Purdue beat Iowa 28–7. No. 5 Penn won at Columbia, 33–0, but dropped from the Top Five. No. 7 USC stayed unbeaten, untied, and unscored upon with a 6–0 win over No. 6 Pacific, and the next poll raised the Trojans to No. 5 behind Notre Dame, Army, Navy, and Purdue.
October 30 In Cleveland, No. 1 Notre Dame beat No. 3 Navy, 33–6. In Philadelphia, No. 2 Army and No. 6 Pennsylvania played to a 13–13 tie. No. 4 Purdue won at Wisconsin, 32–0. No. 5 USC beat California, 13–0, for its sixth straight shutout. The next AP Poll featured No. 1 Notre Dame, No. 2 Purdue, No. 3 Army, No. 4 USC, and No. 5 Penn.
November[]
November 6 At Yankee Stadium in New York, No. 1 Notre Dame beat No. 3 Army, 26–0. No. 2 Purdue won at Minnesota, 14–7. No. 4 USC lost at San Diego to the San Diego Navy team. No. 5 Penn lost to No. 7 Navy, 24–7. No. 6 Michigan beat Indiana 23–6. No. 8 Iowa Pre-Flight continued its unbeaten streak with a 46–19 win at Marquette on November 7, and became the first “service team” to ever reach the AP's Top Five, ranking No. 5 behind Notre Dame, Purdue, Navy, and Michigan.
November 13No. 1 Notre Dame won at Northwestern 25–6. No. 2 Purdue was idle. No. 3 Navy won at Columbia 61–0. No. 4 Michigan beat Wisconsin 27–0. No. 5 Iowa Pre-Flight beat Camp Grant 28–13. The AP voters elevated Iowa Pre-Flight to No. 2 in the next poll, just in time for a showdown with No. 1 Notre Dame. No. 3 Purdue, No. 4 Michigan, and No. 5 Navy rounded out the Top Five.
November 20No. 1 Notre Dame edged No. 2 Iowa Pre-Flight, 14–13. No. 3 Purdue closed its season undefeated (9–0–0) with a 7–0 win at Indiana. No. 4 Michigan closed its season at 8–1–0 with a 45–7 win over Ohio State. No. 5 Navy was idle. No. 6 Duke closed its season at 8–1–0 with a 27–6 win over North Carolina and was raised to No. 5 in the next AP Poll behind Notre Dame, Iowa Pre-Flight, Michigan, and Purdue.
November 27No. 1 Notre Dame closed its season with a 19–14 loss to Great Lakes NTC, 19–14, but still finished No. 1 in the final rankings. Iowa Pre-Flight, which had stayed at No. 2 after its close loss to Notre Dame, beat Minnesota, 32–0, to finish at 9–1–0. No. 3 Michigan, No. 4 Purdue, and No. 5 Duke had finished their seasons. No. 6 Navy closed its season with a 13–0 win over No. 7 Army in the Army–Navy Game, which took place at West Point. The Midshipmen rose to No. 4 in the final poll, behind Notre Dame, Iowa Pre-Flight, and Michigan. Purdue moved down to No. 5, Great Lakes NTC entered the poll at No. 6 after their upset of Notre Dame, and Duke slipped to No. 7.