Ohio Northwest Region defunct athletic conferences

This is a list of former high school athletic conferences in the Northwest Region of Ohio, as designated by the OHSAA. If a conference had members that span multiple regions, the conference is placed in the article of the region most of its former members hail from. Because the names of localities and their corresponding high schools do not always match and because there is often a possibility of ambiguity with respect to either the name of a locality or the name of a high school, the following table gives both in every case, with the locality name first, in plain type, and the high school name second in boldface type. The school's team nickname is given last.

(1929/30-1930/31)

The all-time members of the Black Fork Valley Conference. (1979–1982) Charter Members

The league was created when Columbian, Fremont Ross, and Sandusky left the Little Big 7 league to join with Bowling Green, Findlay, and Fostoria. When Bowling Green and Fostoria left for the Great Northern League (and Tiffin went to the NOL), the league added two schools from the Lake Erie League and rebranded as the Buckeye Conference. The league ended in 1987 as most schools joined either the Buckeye Central Conference or the Erie Shore League.

A small-school county league, the CCL was organized in 1935 and did not have a change in membership until 1958. Nevada joined in 1961, after the Wyandot County League folded, with the CCL only having four remaining schools. Buckeye Central and Colonel Crawford, two recent consolidations, left for the North Central Conference the following year, with the three remaining schools consolidating into Wynford in 1963.

(1956–2003) The GLL existed from fall of 1956 until spring of 2003 before essentially transforming into the Greater Buckeye Conference. It had been born off of the old Great Northern Conference's Orange Division. The following schools were members at some point:

(c. 1945-1956)

The Great Northern Conference was created shortly after the end of World War II with the inaugural members of Clay, Maumee, Perrysburg, Rossford, Whitmer, and Sylvania. Anthony Wayne would join in 1953 after recently being consolidated. The GNC eventually added several members in 1956, splitting into a big schools division (Orange Division) and small schools division (Blue Division), both which would later split off into the Great Lakes League and Northern Lakes League, respectively.

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