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- Oil Geologists’ Reports
- A Guide to the Oil Geologists’ Reports, 1923-1927
- Oil Scrapbooks
- A Guide to the Oil Scrapbooks, ca. 1900-1942
- Oklahoma Historical Society
- A Guide to the Oklahoma Historical Society Oral History Collection, 1956, 1983-1985
- Oldham, Williamson Simpson, 1813-1868
- A Guide to the Williamson Simpson Oldham Reminiscences, 1843-1920
- Oliván Rebolledo, Juan Manuel de, d. 1738 Winthuysen, Thomas Phelipe de
- A Guide to the Juan de Oliván Rebolledo and Thomas Phelipe de Winthuysen Reports, 1691, 1744
- Omohundro, P. G
- A Guide to the Omohundro (P. G.) Papers, 1834-1955
- Onderdonk, Julian
- A Guide to the Julian Onderdonk Alamo Print and Slide, 1963, undated
- Oneal, Benjamin Grady, 1874-1960
- A Guide to the Benjamin Grady Oneal Papers, 1905-1961
- Oppenheimer, Jesse Halff, 1919-2009 George W. Brackenridge Foundation
- A Guide to the George Brackenridge Estate Controversy Collection, 1958-2004 (bulk 1961-1962)
- Ord, Edward Otho Cresap, 1818-1883
- A Guide to the E. O. C. Ord Item, undated
- Ortiz, Juan, family
- A Guide to the Juan Ortiz Family Papers, 1829, 1878
- Orton, Richard David, 1841-1885
- A Guide to the Richard David Orton Papers, 1872-1924
- Orviss, D. A., d. 1895
- A Guide to the D. A. Orviss Papers, 1858-1898
- Oswald, Robert and Helen
- A Guide to the Robert and Helen Oswald Papers, 1917-1930
- Oury, William Sanders, 1817-1887
- A Guide to the William Sanders Oury Narrative, 1930
- Ovetz, Robert
- A Guide to the Robert Ovetz Papers, 1990-1996
- Owen, Jessica E. Owen, Julia D
- A Guide to the Jessica and Julia Owen Sheet Music
- Owens, E.B
- A Guide to the Owens (E.B.) Journal, 1850
- Owens, William A., 1905-1990
- A Guide to the William A. Owens Oral History Transcripts, 1953
- Paddock, B. B. (Buckley B.), 1844-1922
- A Guide to the Buckley Burton Paddock Papers, 1865-1925
- Painter, Theophilus S
- A Guide to the Theophilus S. Painter Papers
- Palm, Swante, 1815-1899
- A Guide to the Swante Palm Papers, 1834-1897
- Palmer, A. Mitchell (Alexander Mitchell), 1872-1936
- A Guide to the Alexander Mitchell Palmer Collection, 1913
- Palmer, Richard
- A Guide to the Richard Palmer Papers, 1940-1986
- Pan American Round Table of Austin
- A Guide to the Pan American Round Table of Austin Records, 1922-2011
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