The 1973 Washington State Cougars football team was an American football team that represented Washington State University in the Pacific-8 Conference (Pac-8) during the 1973 NCAA Division I football season.

In their sixth season under head coach Jim Sweeney, the Cougars compiled a 5–6 record (4–3 in Pac-8, fourth), and were outscored 290 to 250.

[3] The Cougars won their last four games, all in conference, which included a sweep of the three Northwest teams; the season concluded with a second consecutive win in the Apple Cup over Washington, this time a 52–26 rout on the road in Seattle.

[9] [6][7][8] [10][11][12][13][14] Three Washington State players were named to the All-Pac-8 team: senior linebacker Tom Poe, junior guard Steve Ostermann, and junior center Geoff Reece.

[15][16] Ostermann was a repeat selection; he and Reece returned to the first team the next year.