Select School Beginning with "C"
| School | League | County |
|---|---|---|
| Caldwell | Ohio Valley Athletic Conference | Noble |
| Calvert | Midland Athletic League | Seneca |
| Cambridge | East Central Ohio League | Guernsey |
| Canal Winchester | Mid-State League | Franklin |
| Canfield | All-American Conference | Mahoning |
| Canton Central Catholic | Independents - Northeast Ohio | Stark |
| Canton McKinley | Federal League | Stark |
| Canton South | Northeastern Buckeye Conference | Stark |
| Cardinal | Chagrin Valley Conference | Geauga |
| Cardinal Mooney | Steel Valley Conference | Mahoning |
| Cardinal Stritch | Toledo Area Athletic Conference | Lucas |
| Cardington-Lincoln | Mid-Ohio Athletic Conference | Marion |
| Carey | Midland Athletic League | Wyandot |
| Carlisle | Southwestern Buckeye League | Warren |
| Carroll | Greater Catholic League | Montgomery |
| Carrollton | Northeastern Buckeye Conference | Carroll |
| Catholic Central | Ohio Heritage Conference | Clark |
| Catholic Central | Ohio Valley Athletic Conference | Jefferson |
| Cedarville | Ohio Heritage Conference | Greene |
| Celina | Western Buckeye League | Mercer |
| Centennial | Columbus City League | Franklin |
| Centerburg | Mid-Buckeye Conference | Knox |
| Centerville | Greater Western Ohio Conference | Montgomery |
| Central Catholic | Toledo City Athletic League | Lucas |
| Central Catholic Tusc. Co. | Inter-Valley Conference | Tuscarawas |
| Central Christian | Independents - Northeast Ohio | Wayne |
| Central Crossing | Ohio Capital Conference | Franklin |
| Chagrin Falls | Chagrin Valley Conference | Cuyahoga |
| Chalker | Northeastern Athletic Conference | Trumbull |
| Chaminade-Julienne | Greater Catholic League | Montgomery |
| Champion | All-American Conference | Trumbull |
| Chaney | Steel Valley Conference | Mahoning |
| Chardon | Premier Athletic Conference | Geauga |
| Chesapeake | Ohio Valley Conference | Lawrence |
| Chillicothe | Southeastern Ohio Athletic League | Ross |
| Chippewa | Wayne County Athletic League | Wayne |
| Christian Academy | Independents - Southwest | Shelby |
| Cincinnati Christian | Miami Valley Conference | Butler |
| Cincinnati Country Day | Miami Valley Conference | Hamilton |
| Cincinnati Hills Christian Academy | Miami Valley Conference | Hamilton |
| Circleville | Mid-State League | Pickaway |
| Clark Montessori | Miami Valley Conference | Hamilton |
| Clay | Toledo City Athletic League | Lucas |
| Clay | Southern Ohio Conference | Scioto |
| Claymont | East Central Ohio League | Tuscarawas |
| Clear Fork | Ohio Cardinal Conference | Richland |
| Clearview | Patriot Athletic Conference | Lorain |
| Clermont Northeastern | Southern Buckeye Athletic/Academic Conference | Clermont |
| Cleveland Central Catholic | North Coast League | Cuyahoga |
| Cleveland Heights | Lake Erie League | Cuyahoga |
| Cleveland School Of The Arts | Independents - Northeast Ohio | Cuyahoga |
| Clinton Massie | South Central Ohio League | Clinton |
| Cloverleaf | Suburban League | Medina |
| Clyde | Sandusky Bay Conference | Sandusky |
| Coldwater | Midwest Athletic Conference | Mercer |
| Colerain | Greater Miami Conference | Hamilton |
| Collinwood | Cleveland Municipal Schools Senate League | Cuyahoga |
| Colonel Crawford | North Central Conference | Crawford |
| Columbia | Patriot Athletic Conference | Lorain |
| Columbian | Northern Ohio League | Seneca |
| Columbiana | Inter Tri-County League | Columbiana |
| Columbus Academy | Mid-State League | Franklin |
| Columbus Africentric Early College | Columbus City League | Franklin |
| Columbus Alternative | Columbus City League | Franklin |
| Columbus Global Academy | Columbus City SD | Franklin |
| Columbus Grove | Northwest Conference | Putnam |
| Columbus School For Girls | Central Catholic League | Franklin |
| Conneaut | Northeastern Conference | Ashtabula |
| Conotton Valley | Inter-Valley Conference | Harrison |
| Continental Local | Putnam County League | Putnam |
| Copley | Suburban League | Summit |
| Cornerstone Christian Academy | East Suburban Conference | Lake |
| Cory-Rawson | Blanchard Valley Conference | Hancock |
| Coshocton | East Central Ohio League | Coshocton |
| Coventry | Portage Trail Conference | Summit |
| Covington | Cross County Conference | Miami |
| Crestline | North Central Conference | Crawford |
| Crestview | Inter Tri-County League | Columbiana |
| Crestview | Northwest Conference | Van Wert |
| Crestview | Firelands Conference | Richland |
| Crestwood | Portage Trail Conference | Portage |
| Crooksville | Muskingum Valley League | Perry |
| Cuyahoga Falls | Northeast Ohio Conference | Summit |
| Cuyahoga Hts | Chagrin Valley Conference | Cuyahoga |
| Cuyahoga Valley Christian Academy | Principals Athletic Conference | Summit |