The Fox Valley Tri-County League is a former high school athletic conference in Wisconsin, founded in 1924 and dissolved in 1970.
Its membership was concentrated in the Fox River Valley and all public school members belonged to the Wisconsin Interscholastic Athletic Association.
North Fond du Lac joined the Fox Valley Tri-County League in 1928, bringing the loop to nine member schools.
Brandon and Rosendale agreed to a merger of their two districts, and they combined to form a single athletic program until Laconia High School was completed in 1972.
[12][13] Rosendale-Brandon remained in the Fox Valley Tri-County League for its first season, while Dodgeland took Juneau's spot in the Eastern Suburban Conference.