The Baker River, or Asquamchumauke, is a 36.4-mile-long (58.6 km) river in the White Mountains region of New Hampshire, the United States. It rises on the south side of Mount Moosilauke and runs south and east to empty into the Pemigewasset River in Plymouth. The river traverses the towns of Warren, Wentworth, and Rumney. It is part of the Merrimack River watershed.