The 35th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.

Its organizer and first colonel was Gustavus A. Smith after whom it was originally called G.A.

The regiment was mustered out on September 27, 1864, at Springfield, Illinois.

The regiment suffered 7 officers and 91 enlisted men who were killed in action or who died of their wounds and 5 officers and 164 enlisted men who died of disease, for a total of 267 fatalities.

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