Oregon Oregon State University's primary rival is the
University of Oregon. The two schools enjoy a fierce and long-standing rivalry due to the proximity of the two campuses. The University of Oregon is in
Eugene, Oregon, about south of Corvallis. The teams first matched up on the gridiron in 1894 and have been playing each other almost every year since. The rivalry game between the two schools has traditionally been the last game of each season and was long known as the "Civil War Game." The two schools have played each other 128 times, tied for fifth most among any
Division I FBS rivalry. Though not officially recognized by the universities, the
Platypus Trophy is awarded annually to the winning alumni association. Oregon leads the series 69–49–10 through the end of the 2024 season.
Washington State The rivalry with Washington State started in 1895 when Cougars defeated the Beavers 41–35. It is among the
most played FBS rivalries in history. The two rivals have meet 110 times as of 2025 and will play each other twice with a home-and-home series in 2025. Washington State leads the series 57–50–3 through the middle of the 2025 season. The Beavers' largest margin of victory was 66–13 in 2008, while the Cougars' largest margin of victory was 55–7 in 1991. Oregon State's longest win streak against the Cougars is six straight from 1966 to 1971, while Washington State's longest against the Beavers is 10 straight from 1983 to 1993. The rivalry has not been officially named yet, with suggestions including the "Land-Grant Rivalry", the "Cascade Cup", and the "Colombia River Rivalry".
Northwest Championship The Northwest Championship is a rivalry between Oregon, Oregon State,
Washington, and Washington State. The four
Pacific Northwest rivals began playing in a
round-robin format in the
1903 season. No trophy is awarded to the winner, and no organization grants the title, although in 2002, the Washington Huskies wore homemade
t-shirts for the Northwest Championship. ==Retired numbers==