This is a list of high school athletic conferences in the East and Southeast Regions of Ohio, as defined by the OHSAA. 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.
1-790: All schools are also affiliated with the Ohio Valley Athletic Conference. Future Members Former Members This league formed in October 2016 in preparation for August 2017 from the remnants of the South Central Ohio League. Large school division Small school division Former members Scarlet Division Gray Division Former members Departing members Big school Division Small school Division Former Member Division A Division AA Division AAA Division AAAA Division AAAAA Former members: Former members: Formed in 1970 as
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