The 1926 college football season was the first in which an attempt was made to recognize a national champion after the season.
The 1927 college football season ended with the Illini of the University of Illinois (7–0–1) being recognized as champion under the Dickinson System. At season's end, the Rissler Cup was awarded to the team that finished first in the "Dickinson ratings", which considered strength of schedule, in that a win, loss or tie against a "strong" opponent was worth more than one against a lesser team, and the results were averaged.
The 1928 football season had both the USC Trojans and the Georgia Tech Golden Tornado claim national championships. USC was recognized as champions under the Dickinson System, but the Rose Bowl was contested between the No. 2 and No. 3 Dickinson-rated teams, California and Georgia Tech. The game was decided by a safety scored after Roy "Wrong Way" Riegels ran 65 yards in the wrong direction. Vance Maree blocked the ensuing punt which gave Georgia Tech a safety deciding the 8–7 win.
The 1929 college football season saw a number of unbeaten and untied teams. Purdue, Tulane, Notre Dame, and Pittsburgh all finished the regular season with wins over all their opponents. Notre Dame was recognized as national champion by all three of the contemporary major selectors. Houlgate would later name USC (10–2) on the basis of post-season play. Eight of nine retrospective selectors later also named Notre Dame and USC as No. 1 teams.
The 1930 college football season saw Notre Dame repeat as national champion under the Dickinson System, as well as claim the No. 1 position from each of the other three contemporary major selectors,. The post-season Rose Bowl matchup featured two unbeaten (9–0) teams, Washington State and Alabama, ranked No. 2 and No. 3, respectively. Alabama won the Pasadena contest, 24–0.
The 1931 college football season saw the USC Trojans win the Knute Rockne Memorial Trophy as national champion under the Dickinson System, as well as the No. 1 position from each of the other three contemporary major selectors. Rockne, who had coached Notre Dame to a championship in 1930, had been killed in a plane crash on March 31, 1931. For the first time, the champion under the Dickinson System also played in a postseason game. The 1932 Rose Bowl, promoted as a national championship game between the best teams of East and West, matched USC and Tulane, No. 1 and No. 2 in the Dickinson ratings. USC won, 21–12, and was awarded the Albert Russel Erskine Trophy.
The 1932 college football season saw the Michigan Wolverines win the Knute Rockne Memorial Trophy as national champion under the math-based Dickinson System. Because the "Big Nine" conference didn't permit its teams to play in the postseason, however, the Wolverines were not able to accept a bid to the Rose Bowl. As such, the Pasadena game matched the No. 2 and No. 3 teams, USC and Pittsburgh, with the USC Trojans winning the east–west matchup 35–0. The other four contemporary math system selectors all selected USC as national champion. This was also the last season NFL would use college football rules.
The 1933 college football season saw the Michigan Wolverines repeat as winners of the Knute Rockne Memorial Trophy as national champion under the Dickinson System.
The 1934 college football season was the 66th season of college football in the United States. Two New Year's Day bowl games were initiated to rival the Rose Bowl Game. On February 15, Warren V. Miller and Joseph M. Cousins organized the New Orleans Mid-Winter Sports Association and by October, the group had enough funds to sponsor the Sugar Bowl. Meanwhile, W. Keith Phillips and the Greater Miami Athletic Club worked in November at a January 1 game for Florida, and the Orange Bowl was created.
The 1935 college football season was the last one before the Associated Press (AP) writers' poll was used in selecting the national champion. There were seven contemporary math system selectors that year who are informally recognized by the NCAA as "nationwide in scope". The Dickinson System, run by University of Illinois Professor Frank Dickinson, selected Southern Methodist University (SMU) as best in the nation. The Houlgate System, created by Carroll Everard "Deke" Houlgate Sr., also selected SMU. The contemporary Boand, Litkenhous and Poling math rating systems all selected Minnesota as the No. 1 team in the nation. The Dunkel System selected Princeton as its top team. The Williamson System, by Paul O. Williamson of New Orleans, ranked Texas Christian University first.
The 1925 Rose Bowl was a college football bowl game. It was the 11th Rose Bowl Game. The Notre Dame Fighting Irish defeated Stanford University, 27–10. The game featured two legendary coaches, Knute Rockne of Notre Dame, and Pop Warner in his first year at Stanford. The game also featured the Four Horsemen of Notre Dame. Elmer Layden of Notre Dame and Ernie Nevers of Stanford were named the Rose Bowl Players Of The Game when the award was created in 1953 and selections were made retroactively.
The 1925 college football season ended with no clear national champion. At the close of the season, noted sports writer Billy Evans described the championship contest as "a dead heat" among Dartmouth, Tulane, Michigan, Washington, and Alabama.
The 1923 college football season saw several teams finish their seasons unbeaten and untied. As such, numerous schools claim a national championship for the 1923 season. Illinois and Michigan, both members of what is now the Big Ten Conference, finished with records of 8–0 and were selected as national champion by multiple selectors. Illinois featured break-out star Red Grange. Ivy League teams Yale and Cornell also had undefeated seasons. Cornell was selected as national champion by one selector.
The 1951 college football season was the 83rd season of intercollegiate football in the United States. It finished with Princeton halfback Dick Kazmaier winning the Heisman Trophy and the Maxwell Award. Five teams have laid claim to the 1951 national championship:
The 1948 college football season finished with SMU halfback Doak Walker as the Heisman Trophy winner and six teams in contention for the national championship:
- Bennie Oosterbaan's Michigan compiled a 9–0 record, defeated six ranked opponents, and was the consensus national champion, receiving 192 of 333 first-place votes in the final AP Poll. It was Michigan's second consecutive undefeated season, extending the program's winning streak to 23 games.
- Frank Leahy's Notre Dame Fighting Irish compiled a 9–0–1 record and had a 21-game winning streak dating back to the 1946 season before playing a 14–14 tie with USC in the final game of the 1948 season. Notre Dame was ranked No. 2 in the final AP Poll, receiving 97 of 333 first-place votes.
- Carl Snavely's No. 3 North Carolina Tar Heels, led by Heisman Trophy runner-up Charlie Justice, were undefeated in the regular season (9–0–1) but lost to Oklahoma in the 1949 Sugar Bowl.
- Pappy Waldorf's No. 4 California Golden Bears, led by Jackie Jensen who finished fourth in the 1948 Heisman Troophy voting, were undefeated in the regular season (10–0), but lost to Northwestern in the 1949 Rose Bowl.
- Bud Wilkinson's No. 5 Oklahoma Sooners compiled a 10–1 record, including a victory over No. 3 North Carolina in the 1949 Sugar Bowl.
- Earl Blaik's No. 6 Army Cadets finished the season undefeated (8–0–1). They won the first eight games of the season and were ranked No. 3 in the AP Poll before playing Navy to a tie in the annual Army–Navy Game.
The 1947 college football season finished with Notre Dame, Michigan, and Penn State all unbeaten and untied, but the Fighting Irish of Notre Dame were the first place choice for 107 of the 142 voters in the final AP Poll in early December, and repeated as national champions. Michigan was selected for the top spot by six contemporary math systems.
The 1937 college football season ended with the Panthers of the University of Pittsburgh being named the nation's No. 1 team by 30 of the 33 voters in the Associated Press writers' poll. The AP poll was in its second year, and seven votes were taken during the final weeks of the 1937 season, starting with October 18. Each writer listed his choice for the top ten teams, and points were tallied based on 10 for first place, 9 for second, etc., and the AP then ranked the twenty teams with the highest number of points. With 33 writers polled, Pitt received 30 first place votes and 3 second-place, for a total of 327 points.
The 1938 college football season ended with the Horned Frogs of Texas Christian University (TCU) being named the nation's No. 1 team by 55 of the 77 voters in the final Associated Press writers' poll in early December. Tennessee was also chosen by six contemporary math system selectors as a national champion; both teams won every game. Notre Dame was chosen by the Dickinson System and won the Knute Rockne Memorial Trophy.
The 1939 college football season concluded with the Aggies of The Agricultural and Mechanical College of Texas being named as the national champions by the voters in the Associated Press writers' poll. Led by consensus All-American fullback John Kimbrough, the Aggies went undefeated at 11–0 and outscored their opponents by a combined total of 212 to 31, with the defense allowing just 54 first downs and 763 yards all season, or 1.71 yards per play. On New Year's Day, Texas A&M defeated Tulane, 14–13 in the Sugar Bowl.
The 1909 college football season was the first for the 3-point field goal, which had previously been worth 4 points. The season ran from Saturday, September 25, until Thanksgiving Day, November 25, although a few games were played on the week before.