The Big Nine Conference is a former high school athletic conference in Wisconsin, operating from 1985 to 1993 and consisting of nine large high schools in southeastern Wisconsin.
The Big Nine Conference was formed in the aftermath of extensive athletic conference realignment in southeastern Wisconsin following the 1984-85 school year. It was one of three new conferences created that year, along with the North Shore and Suburban Park conferences. This alignment placed the Racine and Kenosha high schools back together in a similar alignment to the old South Shore Conference, but with the addition of four high schools on the south side of Milwaukee[1]. The Milwaukee schools were not in favor of this alignment[2], going to the length of filing a lawsuit against the WIAA to rejoin the Milwaukee City Conference[3][4]. This finally happened in 1993, and the five high schools in Racine and Kenosha went on to form part of the new fifteen-member Southeast Conference[5][6].