1966 Washington State Cougars football team

The 1966 Washington State Cougars football team was an American football team that represented Washington State University in the Athletic Association of Western Universities (AAWU) during the 1966 college football season. Led by third-year head coach Bert Clark, the Cougars compiled a 3–7 record (1–3 in AAWU, tie for sixth), and were outscored by their opponents 211 to 132. Two home games were played on campus at Rogers Field in Pullman, and three at Joe Albi Stadium in Spokane.

The team's statistical leaders included Jerry Henderson with 989 passing yards, Ammon McWashington with 298 rushing yards, and Doug Flansburg with 613 receiving yards.

The trip to the Houston Astrodome in September included a jet flight, the first for Cougar football. It was the first college football game played on artificial turf, the majority (baseball outfield) of the AstroTurf was installed two months earlier in July.

After consecutive losses in the Battle of the Palouse, WSU scored two late touchdowns to defeat Idaho 14–7 in the chilly mud at Neale Stadium; the Cougars have not played in neighboring Moscow since.

Washington State defeated Oregon in the final varsity football game at Hayward Field. In the Apple Cup at Spokane, the Cougars lost for the eighth straight year to rival Washington.