Middle Branch Mad River Country United States States New Hampshire, Maine Counties Coos, NH, Oxford, ME Townships Bean's Purchase, NH, South Oxford, ME Source West Royce Mountain • location Bean's Purchase, NH • coordinates 44°17′43″N 71°1′15″W / 44.29528°N 71.02083°W • elevation 2,340 ft (710 m) Mouth Mad River
South Oxford, ME
44°17′26″N 71°0′24″W / 44.29056°N 71.00667°W Coordinates: 44°17′26″N 71°0′24″W / 44.29056°N 71.00667°W
1,130 ft (340 m) Length 0.8 mi (1.3 km)
Middle Branch of the Mad River is a 0.8-mile-long (1.3 km) mountain brook on the Maine- New Hampshire border in the United States, within the eastern White Mountains. It is a tributary of the  Mad River, a short feeder of the Cold River, part of the Saco River watershed.
The Middle Branch flows east off the slopes of West Royce Mountain, beginning in New Hampshire and finishing in Maine. It joins the Mad River just upstream of Mad River Falls near the foot of the mountain.