Baychester is a neighborhood geographically located in the northeast part of the Bronx, New York City. Its boundaries are East 222nd Street to the northeast, the New England Thruway (I-95) to the east, Gun Hill Road to the southwest, and Boston Road to the northwest. Eastchester Road is the primary thoroughfare through Baychester.

Baychester is dominated by one and two family homes of various styles. The total land area is 2.61 square miles. The area is low lying and flat; some parts of the East Bronx are built on marshland and valleys. The area was formerly home to the amusement park Freedomland U.S.A., opened in 1959 and closed in 1964 on the site of what is now Co-op City. Part of the neighborhood, bounded by Boston, Eastchester, and Gun Hill Roads, is alternately referred to as Fish Bay.