The 86th New York Infantry Regiment ("Steuben Rangers") was an infantry regiment in the Union Army during the American Civil War.

The 86th New York Infantry was organized at Elmira, New York and mustered in for three years service on November 20, 1861, under the command of Colonel Benajah P. Baily.

The regiment was attached to 2nd Brigade, Casey's Division, Army of the Potomac, to March 1862.

Wadsworth's Command, Military District of Washington, to August 1862.

1st Brigade, 3rd Division, III Corps, Army of the Potomac, to June 1863.