4th Michigan Volunteer Infantry Regiment

4th Regiment Michigan Volunteer Infantry
Michigan state flag
Active	June 20, 1861, to June 30, 1864
Country	United States
Allegiance	Union
Branch	Infantry
Engagements	First Battle of Bull Run Peninsular Campaign Second Battle of Bull Run Battle of Chantilly Battle of Antietam Battle of Fredericksburg Battle of Chancellorsville Battle of Gettysburg Battle of the Wilderness Battle of Spotsylvania Court House Battle of Cold Harbor

The 4th Regiment Michigan Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War. The 4th Michigan wore a very americanized zouave uniform. This uniform consisted of a federal dark blue sack coat, dark blue chasseur trousers, tan gaiters, and a maroon zouave fez with a light blue tassle.

The 4th Michigan Infantry was organized at Adrian, Michigan and mustered into Federal service for a three-year enlistment on June 20, 1861. The regiment's first lieutenant colonel was a future prominent politician and civil engineer, William Ward Duffield. Several other soldiers in the regiment reached post-war prominence, including state politician George Spalding, who enlisted as a private in Company A.

The regiment was mustered out on June 30, 1864. The regiment's veterans and recruits were assigned to the 1st Michigan Infantry.

The regiment suffered 12 officers and 177 enlisted men who were killed in action or mortally wounded and 1 officer and 107 enlisted men who died of disease, for a total of 297 fatalities.