Camp Albert L. Mills was a military installation on Long Island, New York. It was located about ten miles from the eastern boundary of New York City on the Hempstead Plains within what is now the village of Garden City. In September 1917, Camp Mills was named in honor of a former Superintendent of the United States Military Academy at West Point, Major General Albert L. Mills, who had suddenly died the year prior in September 1916. Mills was awarded the Medal of Honor for gallantry during the Spanish–American War.

The Hempstead Plains is a region of central Long Island, in what is now Nassau County, in New York State. It was once an open expanse of native grassland estimated to once extend to about 60,000 acres. It was separated from the North Shore of Long Island by the Harbor Hill Moraine, later approximately Route 25. The modern Hempstead Turnpike approximately traces the separation of the plain from the South Shore of Long Island. The east–west extent was from somewhat west of the modern Queens, New York City border to slightly beyond the Suffolk County border.