Authors: F.
- Ober, Frederick A. (Frederick Albion) 1849-1913
- O'Brien, Edward J. (Edward Joseph) 1890-1941
- O'Brien, F. P. 1885-
- O'Connor, William Frederick Travers, Sir 1870-1943
- O'Conor, J. F. X. (John Francis Xavier) 1852-1920
- Oehler, Gottlieb F. -
- Oliver, F. W. (Francis Wall) 1864-1951
- Omelka, František 1904-1960
- Oppeln-Bronikowski, Friedrich von 1873-1936
- Opper, Frederick Burr 1857-1937
- Orvis, C. F. (Charles Frederick) 1831-1915
- Osborn, Henry Fairfield 1857-1935
- Ossendowski, Ferdynand Antoni 1878-1945
- Oswald, Felix L. (Felix Leopold) 1845-1906
- Page-Roberts, F. -
- Paget, Francis Edward 1806-1882
- Painter, F. V. N. (Franklin Verzelius Newton) 1852-1931
- Palmén, Hjalmar F. -
- Panckoucke, C. L. F. (Charles Louis Fleury) 1780-1844
- Parcerisa, F. J. (Francisco Javier) -
- Parker, F. H. M. (Francis Henry Mervyn) 1873-1911
- Parker, Francis W. (Francis Wayland) 1837-1902
- Parkman, Francis 1823-1893
- Parry, Edwin F. 1860-1935
- Partington, Charles Frederick -
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