1st Michigan Volunteer Infantry Regiment (3 Months)

1st Regiment Michigan Volunteer Infantry
Michigan state flag
Active	May 1, 1861, to August 7, 1861
Country	United States
Allegiance	Union
Branch	Infantry
Engagements	Battle of First Bull Run

The 1st Regiment Michigan Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War. A Company consisted of the Detroit Light Guard.

The 1st Michigan Infantry was organized at Detroit, Michigan and mustered into Federal service for three months on May 1, 1861. The 1st Michigan was the state's only three-month regiment, raised in response to President Abraham Lincoln's initial call for 75,000 troops in April 1861.

The regiment was mustered out on August 7, 1861.