The 99th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

[1][2] The 99th Illinois Infantry was organized at Florence, Illinois[3] and mustered into Federal service on August 23, 1862.

[4] The regiment was mustered out on July 31, 1865, and discharged at Springfield, Illinois,[5] on August 9, 1865.

[4] The regiment suffered 4 officers and 47 enlisted men who were killed in action or who died of their wounds 1 officer and 120 enlisted men who died of disease, for a total of 172 fatalities.

This article about a specific military unit of the American Civil War is a stub.