2018 Pac-12 Conference Leaders Opponent Penalties - Games in December/January Only through 01/07/2019
| Name | G | Pen. | Yards | Pen./G | Yards/G | |
|---|---|---|---|---|---|---|
| 1 | Washington State | 1 | 10 | 63 | 10.0 | 63.0 |
| 2 | Washington | 1 | 9 | 53 | 9.0 | 53.0 |
| 3 | Oregon | 1 | 5 | 35 | 5.0 | 35.0 |
| 3 | California | 2 | 8 | 70 | 4.0 | 35.0 |
| 5 | Stanford | 2 | 9 | 69 | 4.5 | 34.5 |
| 6 | Utah | 1 | 3 | 28 | 3.0 | 28.0 |
| 7 | Arizona State | 1 | 3 | 20 | 3.0 | 20.0 |