1984 Washington State Cougars football team

The 1984 Washington State Cougars football team was an American football team that represented Washington State University in the Pacific-10 Conference (Pac-10) during the 1984 NCAA Division I-A football season. In their eighth season under head coach Jim Walden, the Cougars compiled a 6–5 record (4–3 against Pac-10 opponents), finished in fifth place in the Pac-10, and were outscored by their opponents by a combined total of 319 to 317.

The team's statistical leaders included Mark Rypien with 1,927 passing yards, Rueben Mayes with 1,637 rushing yards, and John Marshall with 534 receiving yards.