1989 Sonoma State Cossacks football team

The 1989 Sonoma State Cossacks football team represented Sonoma State University as a member of the Northern California Athletic Conference (NCAC) during the 1989 NCAA Division II football season. Led by first-year head coach Tim Walsh, Sonoma State compiled an overall record of 4–6 with a mark of 2–3 in conference play, placing fourth in the NCAC. The team was outscored by its opponents 205 to 196 for the season. The Cossacks played home games at Cossacks Stadium in Rohnert Park, California.