The 23rd Wisconsin Infantry Regiment was a volunteer infantry regiment that served in the Union Army during the American Civil War.

The 23rd Wisconsin was organized at Madison, Wisconsin, and mustered into Federal service on August 30, 1862.

[1] The regiment was mustered out on July 4, 1865, at Mobile, Alabama.

The 23rd Wisconsin suffered 1 officer and 40 enlisted men killed in action or who later died of their wounds, plus another 5 officers and 262 enlisted men who died of disease, for a total of 308 fatalities.

[2]