The 100th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 100th Illinois Infantry was organized at Joliet, Illinois, and mustered into Federal service on August 30, 1862.

The regiment suffered 7 officers and 73 enlisted men who were killed in action or who died of their wounds and 134 enlisted men who died of disease, for a total of 214 fatalities.

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