Oblate Sisters of Providence
Office of Federal Contract Compliance Programs
Office of Production Management, Minorities (or Minority Groups) Branch
Ohio Commission for Fair Employment Practices Legislation
Old North State Medical, Dental, and Pharmaceutical Society
Omaha, Nebraska: Civic, Literary, and Mutual Aid Associations
100 Black Men of America, Inc.
Operation Crossroads Africa
Order of the Eastern Star
Oregon Fair Employment Practices Advisory Committee
Organization of Afro-American Unity
Organization of Black Airline Pilots
Organization of Black Episcopal Seminarians
Organization of Black Screenwriters, Inc.