Authors: O
- Hopp, Otto -
- Horne, Olive Brown -
- Horne, R. H. (Richard H.) 1802-1884
- Horn, W. O. von 1798-1867
- Hovey, Edmund Otis 1862-1924
- Howard, L. O. (Leland Ossian) 1857-1950
- Howard, O. O. (Oliver Otis) 1830-1909
- Howard, Oscar -
- Howarth, O. J. R. (Osbert John Radcliffe) 1877-1954
- Howd, Otis T. -
- Howes, S. O. (Silas Orrin) 1867-1918
- Huch, Ricarda 1864-1947
- Huckel, Oliver 1864-1940
- Hueffer, Oliver Madox 1876-1931
- Hultgren, Olaf Johan 1827-
- Hultsch, Fridericus (Friedrich Otto) 1833-1906
- Hume, Allan Octavian 1829-1912
- Hunter Blair, David Oswald, Sir 1853-1939
- Huntington, Annie Oakes 1875-1940
- Huntington, Oliver Boardman 1823-1907
- Hyde, Orson 1805-1878
- Hyltén-Cavallius, Gunnar Olof 1818-1889
- Hynninen, Oskari 1865-1906
- ʻUrābī, Aḥmad 1840-1911
- Ignatius, Father, O.S.B. 1837-1908
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