Temple Beth El of Northern Westchester is a Reform Jewish congregation and synagogue located at 220 South Bedford Road, in Chappaqua, Northern Westchester, New York, in the United States.

Founded in 1949, it is notable for its synagogue building, designed by Louis Kahn. Although Kahn designed other synagogues, this is the only one of his designs that was built.

According to the National Trust for Historic Preservation, Kahn accepted the commission in 1966, and completed plans for the octagonal sanctuary six years later, conceived as a Modernist memorial to the Eastern European Jewish past, after whose wooden synagogues it was patterned. A 23,000-square-foot (2,100 m) extension of the synagogue, comprising a large social hall, a kitchen, classrooms, a nursery school, a library, a chapel, a lobby, and new bathrooms was completed by Alexander Gorlin Architects in 2015.