18th Illinois Volunteer Infantry Regiment

18th Regiment Illinois Volunteer Infantry
Illinois state flag
Active	May 28, 1861, to December 31, 1865
Country	United States
Allegiance	Union
Branch	Infantry
Engagements	Fort Henry Fort Donelson Battle of Shiloh Siege of Vicksburg

The 18th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 18th Illinois Infantry was organized at Aurora, Illinois, and mustered into Federal service on May 28, 1861, for a three-year enlistment.

The regiment was mustered out of service on December 31, 1865.

The regiment suffered 6 officers and 99 enlisted men who were killed in action or who died of their wounds and 7 officers and 282 enlisted men who died of disease, for a total of 394 fatalities.