| Unit Name: | 3rd Iowa Infantry Regiment |
| Dates: | June 8, 1861, to November 4, 1864 |
| Country: | United States |
| Allegiance: | Union |
| Branch: | Infantry |
| Size: | 1,099 |
| Battles: | Battle of Shiloh Action at Blue Mills Landing Battle of Hatchie's Bridge Siege of Vicksburg Siege of Jackson Red River Campaign Battle of Kennesaw Mountain Battle of Atlanta |
The 3rd Iowa Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War.
The 3rd Iowa Infantry was organized at Keokuk, Iowa and mustered into Federal forces on June 8, 1861.
The regiment was consolidated into a battalion of three companies in July, 1864 after those members of the regiment who did not reenlist mustered out and the survivors were transferred to 2nd Regiment Iowa Volunteer Infantry as Companies "A," "F," and "I" on November 4, 1864.
Unit strength was 1099. The regiment suffered 8 officers and 119 enlisted men who were killed in action or who died of their wounds and 122 enlisted men who died of disease, for a total of 249 fatalities.[1] 207 were wounded.