Broad Brook is a neighborhood[1] and census-designated place (CDP) in the town of East Windsor, Hartford County, Connecticut, United States.

[2] The Broad Brook CDP occupies most of the east-central part of the town of East Windsor.

It is bordered to the east by the town of Ellington in Tolland County, to the south by Chamberlain Road and Ketch Brook, to the west by the Scantic River, and to the north by Connecticut Route 140 and a portion of Broad Brook, the community's namesake waterway.

[2] As of the census[3] of 2000, there were 3,469 people, 1,433 households, and 932 families residing in the CDP.

28.3% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.