State Librarians of Ohio
| John L. Harper | 1817–1818 |
| John McElvain | 1818–1820 |
| David S. Brodrick | 1820–1824 |
| Zachariah Mills | 1824–1842 |
| Thomas Kennedy | 1842–1845 |
| John B. Greiner | 1845–1851 |
| Elijah Hayward | 1851–1854 |
| James W. Taylor | 1854–1856 |
| William T. Coggeshall | 1856–1862 |
| Samuel G. Harbaugh | 1862–1874 |
| Walter C. Hood | 1874–1875 |
| Hiram H. Robinson | 1875–1877 |
| Rodney M. Stimson | 1877–1879 |
| Henry V. Kerr | 1879–1881 |
| Joseph H. Geiger | 1881–1883 |
| Howard T. Conard | 1883–1885 |
| Hamilton W. Pierson | 1885–1886 |
| Francis B. Loomis | 1886–1887 |
| John M. Doane | 1887–1889 |
| William B. Sibley | 1889–1890 |
| John C. Tuthill | 1890–1892 |
| Joseph P. Smith | 1892–1896 |
| Charles B. Galbreath | 1896–1911 |
| John H. Newman | 1911–1915 |
| Charles B. Galbreath | 1915–1918 |
| John H. Newman | 1918–1921 |
| Herbert S. Hirshberg | 1921–1927 |
| George E. McCormick | 1928–1931 |
| John H. Newman | 1931–1933 |
| Paul A. T. Noon | 1933–1942 |
| Walter T. Brahm | 1942–1963 |
| Ruth Hess, Acting State Librarian | 1963–1966 |
| Joseph F. Shubert | 1966–1977 |
| Richard M. Cheski | 1978–1995 |
| Michael S. Lucas | 1996–2004 |
| Joanne Budler | 2004–2010 |
| Beverly Cain | 2010– |
Compiled through 1961 by Sidney Cohen in a 1961 M. A. thesis from Kent State University; brought up to date through 2010 by State Library of Ohio staff