Creator
- O'Keefe, D. C.2
- O'Kelly, F. C.1
- O'Kelly-Cooke, Amorel E.1
- O'Neal, Tracy6
- O'Neall Specialty Co. (McAllen, Tex.)1
- O'Neil, Bill.1
- O'Neill, John A., approximately 1836-8
- O'Rell, Max, 1848-1903.1
- O. Pierre Havens.1
- O.M. Styron and Co.1
- O.T. Bennett's Studio (Indianapolis, Ind.)1
- Ober.1
- Obermuller & Son (N.Y.)1
- Ochs1
- Ocmulgee Hospital1
- Office of Public Information7
- Office of the Rec. Secretary Georgia Medical Society1
- Official Air Force Photo2
- Official U.S. Navy Photograph26
- Ogden, Woody.1