Select School Beginning with "M"
| School | League | County |
|---|---|---|
| Madeira | Cincinnati Hills League | Hamilton |
| Madison | Southwestern Buckeye League | Butler |
| Madison | Premier Athletic Conference | Lake |
| Madison | Ohio Cardinal Conference | Richland |
| Madison Christian | Mid-Ohio Christian Athletic League | Franklin |
| Madison Plains | South Central Ohio League | Madison |
| Magnificat | Independents - Cleveland Catholic | Cuyahoga |
| Malvern | Inter-Valley Conference | Carroll |
| Manchester | Southern Hills Athletic League | Adams |
| Manchester | Principals Athletic Conference | Summit |
| Mansfield | Ohio Cardinal Conference | Richland |
| Mansfield Christian | Independents - Central, NW, SE | Richland |
| Maple Heights | Lake Erie League | Cuyahoga |
| Mapleton | Firelands Conference | Ashland |
| Maplewood | Northeastern Athletic Conference | Trumbull |
| Margaretta | Sandusky Bay Conference | Erie |
| Mariemont | Cincinnati Hills League | Hamilton |
| Marietta | Southeastern Ohio Athletic League | Washington |
| Marion Catholic | Northwest Central Conference | Marion |
| Marion Harding | Greater Buckeye Conference | Marion |
| Marion L Steele | Southwestern Conference | Lorain |
| Marion Local | Midwest Athletic Conference | Mercer |
| Marion-Franklin | Columbus City League | Franklin |
| Marlington | Northeastern Buckeye Conference | Stark |
| Martin Luther King Jr | Cleveland Municipal Schools Senate League | Cuyahoga |
| Martins Ferry | Ohio Valley Athletic Conference | Belmont |
| Marysville | Ohio Capital Conference | Union |
| Mason | Greater Miami Conference | Warren |
| Massillon Christian | Stark | |
| Mathews | Northeastern Athletic Conference | Trumbull |
| Maumee | Northern Lakes League | Lucas |
| Maumee Valley Country Day | Toledo Area Athletic Conference | Lucas |
| Max S Hayes | Cleveland Municipal Schools Senate League | Cuyahoga |
| Mayfield | Northeast Ohio Conference | Cuyahoga |
| Maysville | Muskingum Valley League | Muskingum |
| McAuley | Girls Greater Cincinnati League | Hamilton |
| McClain | South Central Ohio League | Highland |
| McComb | Blanchard Valley Conference | Hancock |
| McDonald | Inter Tri-County League | Trumbull |
| McKinley | All-American Conference | Trumbull |
| McKinley | Inter Tri-County League | Mahoning |
| McNicholas | Greater Catholic League | Hamilton |
| MC^2 STEM | Cleveland Municipal SD | Cuyahoga |
| Meadowbrook | East Central Ohio League | Guernsey |
| Meadowdale | Southwest Ohio Public League | Montgomery |
| Mechanicsburg | Ohio Heritage Conference | Champaign |
| Medina | Northeast Ohio Conference | Medina |
| Meigs | Tri-Valley Conference | Meigs |
| Memorial | All-American Conference | Mahoning |
| Memorial | Western Buckeye League | Auglaize |
| Mentor | Lake Erie League | Lake |
| Miami East | Cross County Conference | Miami |
| Miami Trace | South Central Ohio League | Fayette |
| Miami Valley | Metro Buckeye Conference | Montgomery |
| Miami Valley Christian Academy | Independents - Southwest | Hamilton |
| Miamisburg | Greater Western Ohio Conference | Montgomery |
| Middletown | Greater Miami Conference | Butler |
| Middletown Christian | Metro Buckeye Conference | Warren |
| Midpark | Southwestern Conference | Cuyahoga |
| Midview | West Shore Conference | Lorain |
| Mifflin | Columbus City League | Franklin |
| Milford | Fort Ancient Valley Conference | Clermont |
| Miller | Tri-Valley Conference | Perry |
| Miller City | Putnam County League | Putnam |
| Millersport | Mid-State League | Fairfield |
| Milton-Union | Southwestern Buckeye League | Montgomery |
| Mineral Ridge | Inter Tri-County League | Trumbull |
| Minerva | Northeastern Buckeye Conference | Stark |
| Minford | Southern Ohio Conference | Scioto |
| Minster | Midwest Athletic Conference | Auglaize |
| Mississinawa Valley | Cross County Conference | Darke |
| Moeller | Greater Catholic League | Hamilton |
| Mogadore | Portage Trail Conference | Summit |
| Mohawk | Midland Athletic League | Sandusky |
| Monclova Christian Academy | Lucas | |
| Monroe | Southwestern Buckeye League | Butler |
| Monroe Central | Ohio Valley Athletic Conference | Monroe |
| Monroeville | Firelands Conference | Huron |
| Montessori HS at University Circle | Cuyahoga | |
| Montpelier | Northwest Ohio Athletic League | Williams |
| Morgan | Muskingum Valley League | Morgan |
| Mother Of Mercy | Girls Greater Cincinnati League | Hamilton |
| Mount Notre Dame | Girls Greater Cincinnati League | Hamilton |
| Mount Vernon | Ohio Capital Conference | Knox |
| Mount Vernon Academy | Independents - Central, NW, SE | Knox |
| Mt Gilead | Mid-Ohio Athletic Conference | Morrow |
| Mt Healthy | Fort Ancient Valley Conference | Hamilton |