Phillips Academy is a co-educational college-preparatory school for boarding and day students located in Andover, Massachusetts, a suburb of Boston. The academy enrolls approximately 1,150 students in grades 9 through 12, including postgraduate students. It is part of the Eight Schools Association and the Ten Schools Admissions Organization.

A boarding school is a school where pupils live within premises while being given formal instruction. The word "boarding" is used in the sense of "room and board", i.e. lodging and meals. As they have existed for many centuries, and now extend across many countries, their functioning, codes of conduct and ethos vary greatly. Children in boarding schools study and live during the school year with their fellow students and possibly teachers or administrators. Some boarding schools also have day students who attend the institution during the day and return home in the evenings.