The 33rd Iowa Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War.

The 33rd Iowa Infantry was organized at Oskaloosa, Iowa and mustered in for three years of Federal service on October 4, 1862.

A total of 1242 men served in the 33rd Iowa at one time or another during its existence.

[1] It suffered 3 officers and 65 enlisted men who were killed in action or who died of their wounds and 1 officer and 215 enlisted men who died of disease, for a total of 284 fatalities.

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