|Bear Brook State Park|
|Location||Allenstown and Hooksett in Merrimack County;|
Deerfield and Candia in Rockingham County,
|Coordinates||43°06′25″N 71°21′07″W / 43.107°N 71.352°WCoordinates: 43°06′25″N 71°21′07″W / 43.107°N 71.352°W|
|Area||10,083 acres (4,080 ha)|
|Elevation||617 feet (188 m)|
|Administered by||New Hampshire Division of Parks and Recreation|
|Designation||New Hampshire state park|
|Website||Bear Brook State Park|
Bear Brook State Park is a 10,000-acre (4,000 ha) preserve in Allenstown, New Hampshire, and neighboring towns. It is one of New Hampshire's largest state parks.
Amenities at Bear Brook include camp sites, a picnic area, over 40 miles (64 km) of hiking trails, swimming and fishing ponds, archery range, camp store, a ball field, playground, bathhouse, shelters, picnic tables, canoe and rowboat rentals, and a physical fitness course. The park is home to the New Hampshire Snowmobile Museum, Old Allenstown Meeting House, and the Richard Diehl Civilian Conservation Corps (CCC) Museum, which are in historic buildings built by the Civilian Conservation Corps.
The park takes its name from Bear Brook, a stream which runs through the park. Its environment is that of the Northeastern coastal forests ecoregion.
In 1985 and 2000, the remains of four females were found in the park. In January 2017, a suspect in the case was identified as Terry Peder Rasmussen (also known by several aliases) who had died in prison in 2010. In June 2019, three of the females were identified.