| Year: | 1989 |
| Team: | Cal Poly Mustangs |
| Sport: | football |
| Conference: | Western Football Conference |
| Short Conf: | WFC |
| Record: | 5–5 |
| Conf Record: | 1–4 |
| Head Coach: | Lyle Setencich |
| Hc Year: | 3rd |
| Stadium: | Mustang Stadium |
The 1989 Cal Poly Mustangs football team represented California Polytechnic State University, San Luis Obispo as a member of the Western Football Conference (WFC) during the 1989 NCAA Division II football season. Led by third-year head coach Lyle Setencich, Cal Poly compiled an overall record of 5–5 with a mark of 1–4 in conference play, placing fifth in the WFC. The team outscored its opponents 230 to 227 for the season. The Mustangs played home games at Mustang Stadium in San Luis Obispo, California.