The 156th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

The 156th Illinois Infantry was mustered into Federal service on February 16, 1865.

The regiment was mustered out on September 20, 1865.

The regiment suffered 2 enlisted men killed in action or mortally wounded and 24 enlisted men who died of disease, for a total of 26 fatalities.

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