The 51st Wisconsin Infantry Regiment was a volunteer infantry regiment that served in the Union Army near the end of the American Civil War.

[1] As the war was nearly over when the unit was formed, the regiment did not participate in any battles.

The colonel of the regiment was Leonard Martin of Wisconsin, a graduate of the United States Military Academy (Class of May 1861) and a captain in the Regular Army, 5th United States Artillery.

[1] Sixteen enlisted men died of disease, for a total of 16 casualties sustained during the unit's history.

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