Brunswick School is an all-boys college-preparatory private day school located in Greenwich, Connecticut, United States. It includes pre-kindergarten, a Lower School (grades 1–4), a Middle School (grades 5–8), and a high school, or, as it is called within the Brunswick Community, Upper School (grades 9–12). The school's mascot is the Bruin, and its colors are brown, white, and gold. The present Headmaster and Head of the Upper School is Thomas Philip. The present Lower and Middle School Heads are Kathleen Signer and Sarah Burdett, respectively.