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- Oakville, Alabama
- Oakwood University
- Oberlin–Wellington Rescue
- Of One Blood (film)
- Olathe, Kansas
- Old City Cemetery (Lynchburg, Virginia)
- Old West Baltimore Historic District
- Ol' Man River
- Omaha Star
- Omega Psi Phi
- Once Upon a Time...When We Were Colored
- One-drop rule
- One More River to Cross
- One People's Project
- Orangeburg massacre
- The Organization (film)
- Organization of Afro-American Unity
- Origins of the American Civil War
- Origins of the blues
- Origins of rock and roll
- Ostend Manifesto
- Othermother
- Oui Be Negroes
- Our Nig
- Out-of-Sync
Read more about this topic: African American Topics