| Conference Championships |
| 1927 Pacific Coast Conference Co-Champions |
| 1928 Pacific Coast Conference Champions |
| 1929 Pacific Coast Conference Champions |
| 1931 Pacific Coast Conference Champions |
| 1932 Pacific Coast Conference Champions |
| 1938 Pacific Coast Conference Co-Champions |
| 1939 Pacific Coast Conference Co-Champions |
| 1943 Pacific Coast Conference Champions |
| 1944 Pacific Coast Conference Champions |
| 1945 Pacific Coast Conference Champions |
| 1947 Pacific Coast Conference Champions |
| 1952 Pacific Coast Conference Champions |
| 1959 Pac 10 Conference Co-Champions |
| 1962 Pac 10 Conference Champions |
| 1964 Pac 10 Conference Co-Champions |
| 1966 Pac 10 Conference Champions |
| 1967 Pac 10 Conference Champions |
| 1968 Pac 10 Conference Champions |
| 1969 Pac 10 Conference Champions |
| 1972 Pac 10 Conference Champions |
| 1973 Pac 10 Conference Champions |
| 1974 Pac 10 Conference Champions |
| 1976 Pac 10 Conference Champions |
| 1978 Pac 10 Conference Champions |
| 1979 Pac 10 Conference Champions |
| 1984 Pac 10 Conference Champions |
| 1987 Pac 10 Conference Co-Champions |
| 1988 Pac 10 Conference Champions |
| 1989 Pac 10 Conference Champions |
| 1993 Pac 10 Conference Co-Champions |
| 1995 Pac 10 Conference Co-Champions |
| 2002 Pac 10 Conference Co-Champions |
| 2003 Pac 10 Conference Champions |
| 2004 Pac 10 Conference Champions |
| 2005 Pac 10 Conference Champions |
| 2006 Pac 10 Conference Co-Champions |
| 2007 Pac 10 Conference Co-Champions |
| 2008 Pac 10 Conference Champions |
| 2017 Pac 12 Conference Champions |
|
| 39 Conference Championships |
