The 9th Illinois Cavalry Regiment was a cavalry regiment that served in the Union Army during the American Civil War.

The regiment was mustered out on October 31, 1865, at Selma, Alabama.

Future governor of Minnesota Samuel Rinnah Van Sant served in the regiment, as did future Nebraska governor Albinus Nance and future Wisconsin legislator Stewart J. Bailey.

One officer and 45 enlisted men were killed in action or died of their wounds, and 6 officers and 241 enlisted men who died of disease, for a total of 293 fatalities.

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