The Pennacook, also known by the names Penacook, and Pennacock, were a North American people of the Wabanaki Confederacy who primarily inhabited the Merrimack River valley of present-day New Hampshire and Massachusetts, as well as portions of southern Maine. They are also sometimes called the Pawtucket people or the Merrimack people.
The Pennacook people were also known by five other names, and lived in the valley of a river running through New Hampshire, Massachusetts, and Maine.