| O C Collins Career Center | Public, 2-year in Chesapeake, OH |
| O'Briens Training Center | Private for-profit, less-than 2-year in South Burlington, VT |
| O'More College of Design | Private not-for-profit, 4-year or above in Franklin, TN |
| Oak Hills Christian College | Private not-for-profit, 4-year or above in Bemidji, MN |
| Oakbridge Academy of Arts | Private for-profit, 2-year in Lower Burrell, PA |
| Oakland City University | Private not-for-profit, 4-year or above in Oakland City, IN |
| Oakland Community College | Public, 2-year in Bloomfield Hills, MI |
| Oakland University | Public, 4-year or above in Rochester Hills, MI |
| Oakton Community College | Public, 2-year in Des Plaines, IL |
| Oakwood College | Private not-for-profit, 4-year or above in Huntsville, AL |
| Oberlin College | Private not-for-profit, 4-year or above in Oberlin, OH |
| Oblate School of Theology | Private not-for-profit, 4-year or above in San Antonio, TX |
| Occidental College | Private not-for-profit, 4-year or above in Los Angeles, CA |
| Occupational Training Services Inc | Private not-for-profit, less-than 2-year in San Diego, CA |
| Ocean Corporation | Private for-profit, less-than 2-year in Houston, TX |
| Ocean County College | Public, 2-year in Toms River, NJ |
| Ocean County Vocational-Technical School | Public, less-than 2-year in Toms River, NJ |
| Oceanside College of Beauty | Private for-profit, less-than 2-year in Oceanside, CA |
| Odessa College | Public, 2-year in Odessa, TX |
| Oehrlein School of Cosmetology | Private for-profit, less-than 2-year in East Peoria, IL |
| Ogden Institute of Massage Therapy | Private for-profit, less-than 2-year in Ogden, UT |
| Ogden-Weber Applied Technology College | Public, 2-year in Ogden, UT |
| Ogeechee Technical College | Public, 2-year in Statesboro, GA |
| Oglala Lakota College | Public, 4-year or above in Kyle, SD |
| Ogle School of Hair Design | Private for-profit, less-than 2-year in Arlington, TX |
| Ogle School of Hair Design | Private for-profit, less-than 2-year in Forth Worth, TX |
| Ogle School of Hair Design | Private for-profit, less-than 2-year in Hurst, TX |
| Ogle School of Hair Design | Private for-profit, less-than 2-year in Dallas, TX |
| Oglethorpe University | Private not-for-profit, 4-year or above in Atlanta, GA |
| Ohio Business College | Private for-profit, 2-year in Sandusky, OH |
| Ohio Business College-Lorain | Private for-profit, 2-year in Lorain, OH |
| Ohio Center for Broadcasting | Private for-profit, less-than 2-year in Valley View, OH |
| Ohio Center for Broadcasting | Private for-profit, less-than 2-year in Cincinnati, OH |
| Ohio Center for Broadcasting-Colorado Campus | Private for-profit, less-than 2-year in Lakewood, CO |
| Ohio Christian University | Private not-for-profit, 4-year or above in Circleville, OH |
| Ohio College of Massotherapy Inc | Private not-for-profit, 2-year in Akron, OH |
| Ohio College of Podiatric Medicine | Private not-for-profit, 4-year or above in Independence, OH |
| Ohio Dominican University | Private not-for-profit, 4-year or above in Columbus, OH |
| Ohio Hi Point Joint Vocational School District | Public, less-than 2-year in Bellefontaine, OH |
| Ohio Institute of Health Careers | Private for-profit, 2-year in Columbus, OH |
