- Old Opera House (Charles Town, W. Va.)1
- Old Stone Presbyterian Church (Lewisburg, W. Va.)1
- Old White Art Colony (White Sulphur Springs, W. Va.)1
- Old, William Whitehurst, 1840-1911.1
- Oldaker, E. C.2
- Oley, John Hunt, 1832-1888.1
- Olmsted, Harry.1
- Olson, Floyd C.5
- Olson, James C.1
- Olson, N. O.28
- Omicron Kappa Upsilon Society. Alpha Beta Chapter (West Virginia University)1
- Omnificent Systems (Charleston, W. Va.)1
- One Valley Bancorp of West Virginia (Charleston, W. Va.)1
- Opera House (Clarksburg, W. Va.)1
- Operations and Policy Research (Firm)1
- Operators' Association of the Williamson Field.2
- Oral History Association.1
- Oral History in the Mid-Atlantic Region.1
- Orcutt, Georgia.1
- Order Sons of Italy in America. Grand Lodge of West Virginia.1
