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Authors
- O'Donnell, Thomas C. (Thomas Clay), 1881-1962, author1
- O'Shea, M. V. (Michael Vincent), 1866-1932, author2
- Obras Sanitarias de la Nación (Argentina)1
- Officer of the British Army, author1
- Oklahoma. State Department of Health, compiler.1
- Olaechea, Abel S., author1
- Oldberg, Oscar, 1846-1913, author1
- Olive, A. H. (Alfred Henderson), 1877- author2
- Oliveira, Americo Vespucio Ribeiro d', author1
- Oliveira, Oswaldo Rodrigues de, author1
- Ontario, enacting jurisdiction.1
- Oppenheimer, Bernard S.1
- Orcutt, Philip Dana, author1
- Oregon, enacting jurisdiction.1
- Oregon. State Board of Health.1
- Orr, H. Winnett (Hiram Winnett), 1877-19563
- Ortiz, Eliseo, author1
- Osgood, Robert B. (Robert Bayley), 1873-3
- Osler, William, Sir, 1849-19193
- Osler, William, Sir, 1849-1919, author1