Authors - O
Odiorne, James
Ogilby, John
Ogumefu, M. I
O'Higgins, Harvey J
Okusa, Yejitsu
Olcott, Frances Jenkins
Olcott, Henry S
Olcott, William Tyler
Old, Walter Gorn (Sepharial)
Oldenberg, Hermann
Oldroyd, Osborn H
Oliphant, Margaret
Oliver, Frederick S
Oliver, George
Ollier, Charles
Oppenheimer, Rebecca W
Orczy, Baroness
Orwell, George
Ouspensky, P. D
Ovid
Owen, G. Vale
Ozaki, Yei Theodora