Brookline is a town in Hillsborough County, New Hampshire, United States. The population was 5,639 at the 2020 census, up from 4,991 at the 2010 census. Brookline is home to the Talbot-Taylor Wildlife Sanctuary, Potanipo Pond, and the Brookline Covered Bridge.

Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2020 census, the population was 422,937, almost one-third the population of the entire state. Its county seats are Manchester and Nashua, the state's two biggest cities. Hillsborough is northern New England's most populous county as well as its most densely populated.