The 1920 Washington State Cougars football team represented Washington State College—now known as Washington State University—as a member of the Northwest Conference and the Pacific Coast Conference (PCC) during the 1920 college football season.
Led by second-year head coach Gus Welch, the Cougars compiled an overall record of 5–1.
Washington State had a record of 3–0 in Northwest Conference play, winning the conference title, and 1–1 against PCC opponents, tying for third place.
[1] This year marked the team's adoption of the "Cougars" nickname.
This college football 1920 season article is a stub.