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.

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

• 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)