Chestnut Hill is a wealthy New England village located six miles (10 km) west of downtown Boston, Massachusetts, United States. It is best known for being home to Boston College and a section of the Boston Marathon route. Like all Massachusetts villages, Chestnut Hill is not an incorporated municipal entity. It is located partially in Brookline in Norfolk County; partially in the city of Boston in Suffolk County, and partially in the city of Newton in Middlesex County. Chestnut Hill's borders are defined by the 02467 ZIP Code. The name refers to several small hills that overlook the 135-acre Chestnut Hill Reservoir rather than one particular hill.

Boston, officially the City of Boston, is the capital and most populous city in the Commonwealth of Massachusetts in the United States. The city serves as the cultural and financial center of the New England region of the Northeastern United States. It has an area of 48.4 sq mi (125 km2) and a population of 675,647 as of the 2020 census, making it the third-largest city in the Northeast after New York City and Philadelphia. The Greater Boston metropolitan statistical area, including and surrounding the city, is the largest in New England and eleventh-largest in the country.