Garrison is a hamlet in Putnam County, New York, United States. It is part of the town of Philipstown, on the east side of the Hudson River, across from the United States Military Academy at West Point. The Garrison Metro-North Railroadstation serves the town. Garrison (a.k.a. Garrison's Landing) was named after 2nd Lieutenant Isaac Garrison who held a property lot on the Hudson River across from West Point and conducted a ferry service across the Hudson River between the two hamlets. Isaac and his son Beverly Garrison fought in the Battle of Fort Montgomery in 1777, were captured by the British and later set free.