Mirey Brook is a 6.5-mile (10.5 km) longstream located in southwestern New Hampshire in the United States. It is a tributary of the Ashuelot River, itself a tributary of the Connecticut River, which flows to Long Island Sound.
Mirey Brook begins in the town of Warwick, Massachusetts, at the confluence of Mountain Brook and Kidder Brook at the foot of Mount Grace. Flowing north, the brook quickly enters the town limits of Winchester, New Hampshire, just as the valley changes from steep and narrow to flat and wide. The brook reaches the Ashuelot River at the village of Winchester.
State Route 78 follows Mirey Brook for the brook's entire length.
A major tributary of Mirey Brook is Roaring Brook, which enters from the east near the village of Scotland, New Hampshire.
Coordinates: 42°46′08″N 72°23′16″W / 42.76889°N 72.38778°W