The 2005 Canadian Football League season is considered to be the 52nd season in modern-day Canadian football, although it is officially the 48th Canadian Football League season.

New ownership groups took controls of two CFL franchises in the 2005 season. The Calgary Stampeders were sold to an ownership group that is led by Ted Hellard and former Stampeder legend, John Forzani. After going through ownership in-fighting, the Ottawa Renegades announced that a new ownership group led by Bill Smith and former Ottawa Rough Riders owner, Bernie Glieberman, would take over the team.

In April, the Toronto Argonauts plans to build a new stadium at York University had been cancelled due to rising costs. However, the owners of the Rogers Centre announced that the Argonauts would be able to remain at the stadium rent-free. Previously, the Argonauts were charged the highest in terms of rent than any other team in the CFL.

Before the season began, the CFL through its partnership with Reebok, introduced new home and away uniforms for all nine teams. Third alternate uniforms were created for all of the teams with the exception of the Toronto Argonauts and the Hamilton Tiger-Cats.

On June 11, the first ever CFL game in Halifax, Nova Scotia is played for the special Touchdown Atlantic pre-season game between the Toronto Argonauts and the Hamilton Tiger-Cats, which ended in a 16–16 draw at Huskies Stadium.

More than 2,303,455 fans filled the stadiums across the country to catch CFL games in 2005, which was a 4% increase from the 2004 season. The 2005 regular season attendance figure also became the all-time highest grossing regular season attendance record in CFL history, by breaking the previous record of 2,229,834 that was set in the 16-game 1978 season. In addition, it marked the fourth consecutive year of national attendance increases for the league.

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