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Bruin is a borough in Butler County, Pennsylvania, United States. The population was 524 at the 2010 census.
Bruin is located in northeastern Butler County in the valley of Bear Creek, a tributary of the Allegheny River. It is approximately 53 miles (85 km) north of Pittsburgh. The borough is surrounded by Parker Township but is separate from it. Pennsylvania Route 268 passes through the center of town, leading northeast 4 miles (6 km) to the city of Parker and south 3 miles (5 km) to Petrolia.
According to the United States Census Bureau, the borough of Bruin has a total area of 1.8 square miles (4.7 km2), all of it land.
Among the early immigrants who settled in the area soon after the close of the Revolutionary war, were a number of north of Ireland families. In 1796, when the settlement of this section of Butler county began, several of these families migrated here, becoming the pioneers of the township. Among those said to have arrived in that year, embracing these north of Ireland families, a few Germans and a number of native-born Pennsylvanians.
The land was first laid out and surveyed by John Martin in 1837 and was known as Martinsburg, then part of Parker Township. The name was later changed to Bruin.