During the American Civil War, Ohio contributed many officers, politicians, and troops to the Union war effort; as well as a small number for the Confederacy.

Union The following is a partial list of generals or rear admirals either born in Ohio or living in Ohio when they joined the Union Army or Union Navy (or in a few cases, men who were buried in Ohio following the war, although they did not directly serve in Ohio units). There also were 134 men given the brevet rank of brigadier general, and occasionally brevet major general, a few of whom are also included in this listing.

Russell Alger Robert Allen Daniel Ammen Jacob Ammen Nicholas L. Anderson Thomas M. Anderson Joseph Bailey Henry B. Banning Joshua Hall Bates John Beatty Samuel Beatty Benjamin W. Brice Roeliff Brinkerhoff William T. H. Brooks Catharinus P. Buckingham Ralph P. Buckland Don Carlos Buell William W. Burns Cyrus Bussey John Allen Campbell Henry B. Carrington Samuel S. Carroll Henry M. Cist James M. Comly Jacob D. Cox George Crook George A. Custer Joel A. Dewey Charles C. Doolittle Charles Ewing Hugh Ewing Thomas Ewing, Jr. Lucius Fairchild James W. Forsyth John W. Fuller James A. Garfield Kenner Garrard Charles C. Gilbert Quincy A. Gillmore Robert S. Granger Ulysses S. Grant William Grose Charles Griffin Charles G. Harker Andrew L. Harris Benjamin Harrison Philip C. Hayes Rutherford B. Hayes William B. Hazen Andrew Hickenlooper Edward H. Hobson Joseph Hooker Henry J. Hunt Albert Kautz Augustus V. Kautz Joseph W. Keifer Robert P. Kennedy Edward N. Kirk Mortimer D. Leggett Eli Long William H. Lytle Jasper A. Maltby Mahlon D. Manson John S. Mason George B. McClellan Alexander M. McCook Anson G. McCook Daniel McCook, Jr. Edward M. McCook Edwin S. McCook George McCook Robert L. McCook Irvin McDowell Nathan C. McLean William L. McMillen James B. McPherson John G. Mitchell Robert B. Mitchell Ormsby M. Mitchel George W. Morgan Emerson Opdycke Thomas O. Osborn Marsena R. Patrick Eleazar A. Paine Halbert E. Paine Abram S. Piatt Orlando Poe Joseph H. Potter John Pope Benjamin Potts William H. Powell James W. Reilly James Sidney Robinson William Rosecrans Benjamin P. Runkle Jeremiah M. Rusk Delos B. Sackett Eliakim P. Scammon James F. Schenck Robert C. Schenck Robert K. Scott William T. Sherman Philip H. Sheridan Isaac R. Sherwood Joshua W. Sill John P. Slough Thomas Kilby Smith William Sooy Smith John W. Sprague David S. Stanley James Blair Steedman Wager Swayne John C. Tidball Edward D. Townsend James M. Tuttle Erastus B. Tyler Ferdinand Van Derveer Melancthon S. Wade George D. Wagner Charles C. Walcutt William H. L. Wallace Willard Warner Godfrey Weitzel Thomas Welsh August Willich Thomas J. Wood Charles R. Woods William B. Woods

Confederacy

In addition, the following Ohioans served as generals in the Confederate States Army:

Charles Clark Robert H. Hatton Bushrod Johnson Philip N. Luckett Daniel H. Reynolds Roswell S. Ripley Otho F. Strahl

See also Ohio in the American Civil War List of American Civil War generals (Union) List of American Civil War brevet generals (Union) List of American Civil War generals (Confederate)