The 1921 Cornell Big Red football team was an American football team that represented Cornell University as an independent during the 1921 college football season. In its second season under head coach Gil Dobie, Cornell compiled an 8–0 record, shut out five of eight opponents (including a 110–0 win over Western Reserve), and outscored all opponents by a total of 392 to 21. The 1921 season was part of 26-game winning streak that continued until October 1924 and included national championship claims for 1921, 1922, and 1923.