| Post: | Ohio Adjutant General |
| Insignia: | Seal of Ohio (B&W).svg |
| Insigniasize: | 150 |
| Insigniacaption: | Seal of the State of Ohio |
| Incumbent: | Major General John C. Harris, Jr. |
| Incumbentsince: | 2019 |
| Nominator: | Governor of Ohiowith advice and consent from the Ohio Senate |
| Appointer: | Governor of the State of Ohio |
| Reports To: | Secretary of Public Safety |
| Department: | Ohio National Guard |
| Deputy: | Deputy Adjutant General |
| Termlength: | indefinite |
| Website: | www.nationalguard.com |
Ohio Adjutant General's Department is in the executive branch of government in the State of Ohio concerned with the military forces of the State of Ohio in the United States of America.
The Adjutant General has responsibility for the Ohio Army National Guard, the Ohio Air National Guard, the Ohio Naval Militia and the Ohio Military Reserve.
| Term | Name | Party | |
|---|---|---|---|
| 1803 | Cornelius R. Sedan | Republican | |
| 1803–1806 | Republican | ||
| 1806–1807 | Federalist | ||
| 1807–1809 | Federalist | ||
| 1809–1810 | Republican | ||
| 1810–1811 | Republican | ||
| 1811–1812 | Federalist | ||
| 1812–1818 | Republican | ||
| 1818–1828 | Republican | ||
| 1828–1837 | Samuel C. Andrews | Federalist | |
| 1837–1839 | William Doherty | Whig | |
| 1839–1841 | Joseph Medary, Jr. | Democrat | |
| 1841–1845 | Edward H. Cummings | Whig | |
| 1845–1851 | Thomas W.H. Mosely | Whig | |
| 1851–1857 | J.W. Wilson | Democrat | |
| 1857–1861 | Republican | ||
| 1861–1862 | Republican | ||
| 1862–1864 | Charles W. Hill | Republican | |
| 1864–1868 | Republican | ||
| 1868–1869 | E.P. Schneider | Republican | |
| 1869–1874 | William Knapp | Republican | |
| 1874–1876 | John T. Amos | Democrat | |
| 1876–1877 | Republican | ||
| 1877–1878 | Charles W. Carr | Republican | |
| 1878–1880 | Luther W. Meiley | Democrat | |
| 1880–1881 | Republican | ||
| 1881–1884 | Samuel B. Smith | Republican | |
| 1884–1886 | Democrat | ||
| 1886–1890 | Henry A. Axline | Republican | |
| 1890–1891 | Morton L. Hawkins | Democrat | |
| 1891–1892 | Thomas T. Dill | Democrat | |
| 1892–1893 | Edgar J. Pocock | Republican | |
| 1893–1896 | James C. Howe | Republican | |
| 1896–1898 | Henry A. Axline | Republican | |
| 1898 | Herbert B. Kingsley | Republican | |
| 1899–1900 | Henry A. Axline | Republican | |
| 1900–1904 | George R. Gyger | Republican | |
| 1904–1905 | Ammon B. Critchfield | Republican | |
| 1906 | Oliver H. Hughes | Democrat | |
| 1906–1908 | Ammon B. Critchfield | Republican | |
| ... | |||
| 1941–1942 | |||
| 1942–1949 | |||
| 1949–1959 | |||
| ... | |||
| 1988–1999 | Richard Alexander | http://www.ohiomemory.org/cdm/ref/collection/p15005coll9/id/632 | |
| 1999–2004 | John H. Smith | - | |
| 2004–2011 | - | ||
| 2011–2014 | - | ||
| 2015–2019 | - | ||
| 2019–Present | - |
. ohiowar1. Ohio in the War Her Statesmen Generals and Soldiers . 600 . Whitelaw Reid. The Robert Clarke Company . 1895 . 1 . Cincinnati .
(This source say that before the civil war "Ormsby M. Mitchel was for two years Adjutant-General of the State of Ohio")