Henry Seymour Lansing (1824-1882) was an American Brevet Brigadier General who commanded the 17th New York Infantry Regiment during some of the deadliest battles of the American Civil War as well as commanding the 3rd Brigade of the 1st Division of the V Corps.

[1] Prior to the war, Lansing was a key participant of the establishment of the Military Association of New York.

On October 17, the 17th New York became part of the Army of the Potomac and Lansing was the commander of the 3rd Brigade of the 1st Division of the V Corps Briefly during 2nd Bull run.

Lansing then worked for the American European Express and spent several years in Paris as their representative and on 1876, was a auditor of the Philadelphia Centennial.

[1] Lansing died on April 13, 1882, and was buried at St. Mary's Episcopal Church, Burlington, New Jersey.