Lake Boon is a lake in eastern Massachusetts covering about 163 acres (0.66 km2) in the towns of Stow and Hudson, Massachusetts. The lake is approximately 1.5 miles long and consists of four basins connected by narrows. The first and largest basin at the north-west end of the lake stretches from a dam along Barton Road in Stow down to narrows just above the towns south border. It is the only part of the lake that is completely within Stow. The second basin is about half the size of the first and straddles the border with Hudson. The 3rd and 4th basins at the eastern end of the lake are much smaller and less easily navigable due to shallow waters and significant plant-growth.