Authors: willis
- Nicoll, W. Robertson (William Robertson), Sir 1851-1923
- Nolan, William F. 1928-2021
- Norman, William B. -
- Norris, W. E. (William Edward) 1847-1925
- Norris, William -
- Norris, William A. 1896-1964
- North, William -1854
- Norton, William Harmon 1856-1944
- Nowlin, William 1821-1884
- Noyes, William 1862-1928
- Nylander, John William 1869-1949
- Oates, Eugene William 1845-1911
- Oberfield, William -
- Oberhardt, William 1882-1958
- O'Brien, William 1852-1928
- O'Brien, William D. -
- O'Connor, William Douglas 1832-1889
- O'Connor, William Frederick Travers, Sir 1870-1943
- Oesterley, W. O. E. (William Oscar Emil) 1866-1950
- Ogilvie-Grant, W. R. (William Robert) 1863-1924
- Ogilvie, William 1688-1729
- Olcott, William Tyler 1873-1936
- Oldfather, W. A. (William Abbott) 1880-1945
- Oman, Charles 1860-1946
- Omond, George W. T. (George William Thomson) 1846-1929
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