The 2003 Canadian Football League season is considered to be the 50th season in modern-day Canadian football, although it is officially the 46th Canadian Football League season. The pre-season began on May 30, 2003 and the regular season started on June 17, 2003.Taylor Field in Regina, Saskatchewan hosted the 91st Grey Cup on November 16, with the Edmonton Eskimos defeating the Montreal Alouettes 34-22.

The Canadian Football League made a new five-year television deal with TSN and the CBC on February 27. Through the new agreement, TSN and CBC will be broadcasting 77 games, which is the most in CFL history. The CFL also introduced new specialty weekends that includes the Canada Day Bash, the Labour Day Classic and the Gridiron Thanksgiving. CFL.ca launched its new website in July.

The CFL also assumes control of the Toronto Argonauts on July 29 and the Hamilton Tiger-Cats on August 15. The league appointed Paul Robson as the interim Operations Manager of the Argonauts and appointed Alan Ford to become interim Operations Manager of the Tiger-Cats. The CFL then announced the sale of the Hamilton Tiger-Cats to Bob Young on October 7 and then announced the sale of the Toronto Argonauts on November 15 to Howard Sokolowski and David Cynamon.

The TSN achieved the second-highest viewership in CFL history. The CFL also had an (+2%) increase in attendance for the second straight season with more than 2 million fans filling the seats at Canadian football games. About 4.4 million Canadian homes viewed the 91st Grey Cup game between the Montreal Alouettes and the Edmonton Eskimos played in Regina. Plus, the CFL signed long-term partnership deals with Reebok, Rogers and Sun Microsystems.

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