This is a list of American Civil War units from Iowa which fought in the Union Army. A total of 48 infantry regiments, nine cavalry regiments, and four artillery batteries were raised from Iowa.
Infantry
1st Iowa Infantry Regiment
1st Iowa Infantry Regiment (African Descent) 2nd Iowa Infantry Regiment 3rd Iowa Infantry Regiment 4th Iowa Infantry Regiment 5th Iowa Infantry Regiment 6th Iowa Infantry Regiment 7th Iowa Infantry Regiment 8th Iowa Infantry Regiment 9th Iowa Infantry Regiment 10th Iowa Infantry Regiment 11th Iowa Infantry Regiment 12th Iowa Infantry Regiment 13th Iowa Infantry Regiment 14th Iowa Infantry Regiment 15th Iowa Infantry Regiment 16th Iowa Infantry Regiment 17th Iowa Infantry Regiment 18th Iowa Infantry Regiment 19th Iowa Infantry Regiment 20th Iowa Infantry Regiment 21st Iowa Infantry Regiment 22nd Iowa Infantry Regiment 23rd Iowa Infantry Regiment 24th Iowa Infantry Regiment 25th Iowa Infantry Regiment 26th Iowa Infantry Regiment 27th Iowa Infantry Regiment 28th Iowa Infantry Regiment 29th Iowa Infantry Regiment 30th Iowa Infantry Regiment 31st Iowa Infantry Regiment 32nd Iowa Infantry Regiment 33rd Iowa Infantry Regiment 34th Iowa Infantry Regiment 35th Iowa Infantry Regiment 36th Iowa Infantry Regiment 37th Iowa Infantry Regiment - The "Graybeard Regiment" 38th Iowa Infantry Regiment 39th Iowa Infantry Regiment 40th Iowa Infantry Regiment 41st Iowa Infantry Regiment - Failed to complete organization and was not mustered into service. 41st Battalion Iowa Volunteer Infantry 42nd Iowa Infantry Regiment - Failed to complete organization and was not mustered into service. 43rd Iowa Infantry Regiment - Failed to complete organization and was not mustered into service. 44th Iowa Infantry Regiment - 100-day service regiment 45th Iowa Infantry Regiment - 100-day service regiment 46th Iowa Infantry Regiment - 100-day service regiment 47th Iowa Infantry Regiment - 100-day service regiment 48th Iowa Infantry Regiment - 100-day service regiment, failed to complete organization and was not mustered as regiment, see 48th Battalion Iowa Volunteer Infantry. 48th Iowa Infantry Battalion - 100-day service unit
Cavalry
1st Iowa Cavalry Regiment
2nd Iowa Cavalry Regiment
3rd Iowa Cavalry Regiment
4th Iowa Cavalry Regiment
5th Iowa Cavalry Regiment
6th Iowa Cavalry Regiment
7th Iowa Cavalry Regiment
8th Iowa Cavalry Regiment
9th Iowa Cavalry Regiment
Artillery
1st Iowa Independent Battery Light Artillery
2nd Iowa Independent Battery Light Artillery
3rd Iowa Independent Battery Light Artillery - "The Dubuque Battery" 4th Iowa Independent Battery Light Artillery