2018 Pac-12 Conference Leaders Opponent Penalties - Games in August/September Only through 01/07/2019
| Name | G | Pen. | Yards | Pen./G | Yards/G | |
|---|---|---|---|---|---|---|
| 1 | Arizona | 5 | 47 | 461 | 9.4 | 92.2 |
| 2 | Washington State | 5 | 45 | 358 | 9.0 | 71.6 |
| 3 | USC | 5 | 37 | 329 | 7.4 | 65.8 |
| 4 | Washington | 5 | 33 | 288 | 6.6 | 57.6 |
| 5 | Arizona State | 5 | 31 | 276 | 6.2 | 55.2 |
| 6 | California | 4 | 30 | 288 | 7.5 | 72.0 |
| 6 | Stanford | 5 | 30 | 304 | 6.0 | 60.8 |
| 6 | Colorado | 4 | 30 | 232 | 7.5 | 58.0 |
| 9 | Oregon State | 5 | 28 | 240 | 5.6 | 48.0 |
| 10 | UCLA | 4 | 27 | 198 | 6.8 | 49.5 |
| 11 | Oregon | 5 | 25 | 183 | 5.0 | 36.6 |
| 12 | Utah | 4 | 23 | 224 | 5.8 | 56.0 |