The Saskatchewan Roughriders are a professional Canadian football team based in Regina, Saskatchewan. The Roughriders compete in the Canadian Football League (CFL) as a member club of the league's West Division.

The Roughriders were founded in 1910 as the Regina Rugby Club. Although Saskatchewan was not the first team to play football in Western Canada, the club has maintained an unbroken organizational continuity since their founding. The Roughriders are the fourth-oldest professional gridiron football team in existence today (only the Arizona Cardinals, Hamilton Tiger-Cats and Toronto Argonauts are older), and one of the oldest professional sports teams still in existence in North America. Of these teams, the Roughriders are both the oldest still in existence that continuously has been based in Western Canada (as well as the oldest surviving team in the CFL's present-day West Division) and the oldest in North America to continuously have been based west of St. Louis, Missouri. They are also the continent's oldest community-owned professional sports franchise, older than every American professional sports team outside baseball other than the aforementioned Cardinals (who, unlike the Roughriders, no longer play in their original city, and have moved twice in their history) and older than every Canadian sports team outside football except the Montreal Canadiens, who were founded about nine months prior to the Roughriders. The team changed their name to the Regina Roughriders in 1924, and to the current moniker in 1946. The Roughriders played their home games at historic Taylor Field from 1936 to 2016; in 2017, the team moved to the newly constructed Mosaic Stadium at Evraz Place.

The team draws fans from across Saskatchewan and Canada who are affectionately known as the Rider Nation. The Roughriders play in the smallest market in the CFL, and the second-smallest major-league market in North America (only Green Bay, Wisconsin is smaller). They have finished first in what is now the West Division eight times and have won the Western championship a record 28 times. They have played for the Grey Cup 19 times, winning four.

The team has had 20 players inducted into the Canadian Football Hall of Fame. The Riders' biggest rival is the Winnipeg Blue Bombers; games between the two are often sold out before the beginning of the season. The Roughriders Football Club and the city of Regina have hosted the Grey Cup three times, including a Roughrider win in the 101st Grey Cup.