The 87th New York Infantry Regiment (aka "13th Brooklyn" or 13th New York State Militia) was an infantry regiment in the Union Army during the American Civil War.

[1] The regiment was attached to 3rd Brigade, Casey's Division, Army of the Potomac, to March 1862.

1st Brigade, 3rd Division, III Corps, Army of the Potomac, to August 1862.

Company B was transferred to the 173rd New York Volunteer Infantry on September 11, 1862.

Pope's Campaign in northern Virginia August 26 – September 2.