St. Thomas' Episcopal Church Complex is a historic Episcopal church complex at 158-168 W. Boston Post Road in Mamaroneck, Westchester County, New York.

The Gothic Revival-style church is constructed entirely of rough-dressed Belleville brownstone with a red slate gable roof.

It features a square tower on the north facade with clock faces and louvres.

The property also includes the Parish House / Chapel (1884-1886), Endowment Building (1887), and Heathcote Hall (1925).

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