| Mirey Brook | |
| Pushpin Map: | New Hampshire#Massachusetts#USA |
| Pushpin Map Size: | 250 px |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | States |
| Subdivision Name2: | Massachusetts, New Hampshire |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Franklin, MA, Cheshire, NH |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Warwick, MA, Winchester, NH |
| Length: | 6.5miles |
| Source1: | Mount Grace |
| Source1 Location: | Warwick, MA |
| Source1 Coordinates: | 42.7014°N -72.3617°W |
| Source1 Elevation: | 995feet |
| Mouth: | Ashuelot River |
| Mouth Location: | Winchester, NH |
| Mouth Coordinates: | 42.7686°N -72.3881°W |
| Mouth Elevation: | 130m (430feet) |
| Tributaries Left: | Black Brook |
| Tributaries Right: | Mountain Brook, Roaring Brook |
Mirey Brook is a 6.5adj=midNaNadj=mid[1] stream in northern Massachusetts and 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 outlet of a wetland at the northern base of Mount Grace. It flows north to the head of Sunny Valley, where it receives Mountain Brook and Kidder Brook from the southeast. Continuing north, the brook 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 from its confluence with Mountain Brook to its mouth at the Ashuelot.
A major tributary of Mirey Brook is Roaring Brook, which enters from the east near the village of Scotland, New Hampshire.