Authors: Henry
- Olcott, Henry Steel 1832-1907
- Oldenburg, Henry -1677
- Olerich, Henry 1851-1927
- Orléans, Henri d', Prince 1867-1901
- Osborn, Henry Fairfield 1857-1935
- Osborn, H. S. (Henry Stafford) 1823-1894
- Overton, John Henry 1835-1903
- Oyen, Henry 1883-1921
- Paget, Arthur 1851-1928
- Paget, H. M. (Henry Marriott) 1857-1936
- Pailleron, Edouard 1834-1899
- Palmer, Edward Henry 1840-1882
- Palmer, G. H. (George Henry) 1871-
- Paque, Oliver 1846-1908
- Parker, De Witt H. (De Witt Henry) 1885-1949
- Parker, F. H. M. (Francis Henry Mervyn) 1873-1911
- Parker, H. (Henry) 1849-
- Parker, John Henry 1806-1884
- Parker, John H. (John Henry) 1866-1942
- Paton, Henry -
- Patterson, Henry W. -
- Patterson, J. H. (John Henry) 1867-1947
- Paull, H. B., Mrs. 1812-1888
- Payne, George Henry 1876-1945
- Payne, Henry Neville, active 1672-1710 -1709
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