The Pacific Twelve was known as the Pacific Ten (1978-2011) and as the Pacific 8 (1968-'77).

1968 Southern California (6-0)
1969 Southern California (6-0)
1970 Stanford (6-1)
1971 Stanford (6-1)
1972 Southern California (7-0)
1973 Southern California (7-0)
1974 Southern California (6-0-1)
1975 UCLA (6-1), California (6-1)
1976 Southern California (7-0)
1977 Washington (6-1)
1978 Southern California (6-1)
1979 Southern California (6-0-1)
1980 Washington (6-1)
1981 Washington (6-2)
1982 UCLA (5-1-1)
1983 UCLA (6-1-1)
1984 Southern California (7-1)
1985 UCLA (6-2)
1986 Arizona State (5-1-1)
1987 Southern California (7-1), UCLA (7-1)
1988 Southern California (8-0)
1989 Southern California (6-0-1)
1990 Washington (7-1)
1991 Washington (8-0)
1992 Stanford (6-2), Washington (6-2)
1993 UCLA (6-2), Arizona (6-2), Southern California (6-2)
1994 Oregon (7-1)
1995 Southern California (6-1-1), Washington (6-1-1)
1996 Arizona State (8-0)
1997 Washington State (7-1), UCLA (7-1)
1998 UCLA (8-0)
1999 Stanford (7-1)
2000 Oregon (7-1), Oregon State (7-1), Washington (7-1)
2001 Oregon (7-1)
2002 Southern California (7-1), Washington State (7-1)
2003 Southern California (7-1)
2004 Southern California (8-0)
2005 Southern California (8-0)
2006 Southern California (7-2), California (7-2)
2007 Southern California (7-2), Arizona State (7-2)
2008 Southern California (8-1)
2009 Oregon (8-1)
2010 Oregon (9-0)
2011 Oregon (8-1 N) 49, UCLA (5-4 S) 31

Pac 12 championship game results listed for 2011-