Record*: 66-50, .569 W-L% (4th of 12) (Schedule and Results)
*W-L-T adjusted to 54-50 by NCAA.
SRS: 6.61 (3rd of 12) ▪ SOS: 4.03 (3rd of 12)
Conference Champion: Southern California
Ranked in Preseason AP Poll: 3 (Arizona State, California and Southern California)
Ranked in Final AP Poll: 4 (California, Oregon, Southern California and UCLA)
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
|---|---|---|---|---|---|---|---|---|
| 1 | Sep 10, 2005 | Sat | (16) California | 56 | @ | Washington | 17 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 2 | Sep 24, 2005 | Sat | (18) Arizona State | 42 | @ | Oregon State | 24 | |
| 3 | Sep 24, 2005 | Sat | (1) Southern California | 45 | @ | (24) Oregon | 13 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 4 | Oct 1, 2005 | Sat | (12) California | 28 | Arizona | 0 | ||
| 5 | Oct 1, 2005 | Sat | Oregon | 44 | @ | Stanford | 20 | |
| 6 | Oct 1, 2005 | Sat | Oregon State | 44 | Washington State | 33 | ||
| 7 | Oct 1, 2005 | Sat | (1) Southern California | 38 | @ | (14) Arizona State | 28 | |
| 8 | Oct 1, 2005 | Sat | (20) UCLA | 21 | Washington | 17 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 9 | Oct 8, 2005 | Sat | (25) Oregon | 31 | @ | (17) Arizona State | 17 | |
| 10 | Oct 8, 2005 | Sat | (1) Southern California | 42 | Arizona | 21 | ||
| 11 | Oct 8, 2005 | Sat | Stanford | 24 | @ | Washington State | 21 | |
| 12 | Oct 8, 2005 | Sat | (20) UCLA | 47 | (10) California | 40 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 13 | Oct 15, 2005 | Sat | (20) Oregon | 45 | Washington | 21 | ||
| 14 | Oct 15, 2005 | Sat | Oregon State | 23 | @ | (18) California | 20 | |
| 15 | Oct 15, 2005 | Sat | Stanford | 20 | @ | Arizona | 16 | |
| 16 | Oct 15, 2005 | Sat | (12) UCLA | 44 | @ | Washington State | 41 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 17 | Oct 22, 2005 | Sat | (25) California | 42 | Washington State | 38 | ||
| 18 | Oct 22, 2005 | Sat | (15) Oregon | 28 | @ | Arizona | 21 | |
| 19 | Oct 22, 2005 | Sat | (1) Southern California | 51 | @ | Washington | 24 | |
| 20 | Oct 22, 2005 | Sat | Stanford | 45 | Arizona State | 35 | ||
| 21 | Oct 22, 2005 | Sat | (8) UCLA | 51 | Oregon State | 28 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 22 | Oct 29, 2005 | Sat | Arizona | 29 | @ | Oregon State | 27 | |
| 23 | Oct 29, 2005 | Sat | Arizona State | 44 | Washington | 20 | ||
| 24 | Oct 29, 2005 | Sat | (1) Southern California | 55 | Washington State | 13 | ||
| 25 | Oct 29, 2005 | Sat | (8) UCLA | 30 | @ | Stanford | 27 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 26 | Nov 5, 2005 | Sat | Arizona | 52 | (7) UCLA | 14 | ||
| 27 | Nov 5, 2005 | Sat | Arizona State | 27 | @ | Washington State | 24 | |
| 28 | Nov 5, 2005 | Sat | (15) Oregon | 27 | (23) California | 20 | ||
| 29 | Nov 5, 2005 | Sat | Oregon State | 18 | @ | Washington | 10 | |
| 30 | Nov 5, 2005 | Sat | (1) Southern California | 51 | Stanford | 21 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 31 | Nov 12, 2005 | Sat | (11) Oregon | 34 | @ | Washington State | 31 | |
| 32 | Nov 12, 2005 | Sat | (1) Southern California | 35 | @ | California | 10 | |
| 33 | Nov 12, 2005 | Sat | Stanford | 20 | @ | Oregon State | 17 | |
| 34 | Nov 12, 2005 | Sat | (14) UCLA | 45 | Arizona State | 35 | ||
| 35 | Nov 12, 2005 | Sat | Washington | 38 | @ | Arizona | 14 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 36 | Nov 19, 2005 | Sat | California | 27 | @ | Stanford | 3 | |
| 37 | Nov 19, 2005 | Sat | (10) Oregon | 56 | Oregon State | 14 | ||
| 38 | Nov 19, 2005 | Sat | Washington State | 26 | @ | Washington | 22 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 39 | Nov 25, 2005 | Fri | Arizona State | 23 | Arizona | 20 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 40 | Dec 3, 2005 | Sat | (1) Southern California | 66 | (11) UCLA | 19 |