Holbrook is a large hamlet and census-designated place located in the central part of Long Island, within the Town of Brookhaven in Suffolk County, New York. It offers a primarily suburban residential environment that developed significantly in the mid-20th century. Holbrook is known for its convenient access to major roadways like the Long Island Expressway (I-495) and Sunrise Highway (Route 27), as well as its local schools within the Sachem Central School District. The community provides a mix of housing options and local amenities.