Thomas J. Duff was an architect noted for his design of a number of religious buildings for the Roman Catholic Archdiocese of New York during its major expansion at the beginning of the 20th century.

His firm was headquartered first at the Metropolitan Building, 1 Madison Avenue,Catalogue of the ... Annual Exhibition of the Architectural League of New York, Volume 9, 1893, p. xx and later at 407 West 14th Street, Manhattan,Office for Metropolitan History and in Mount Vernon in Westchester County. Duff was a member of the Architectural League of New York.Building: An Architectural Monthly, Volume 10, W. T. Comstock, 1889, p. 76

Buildings designed by Duff The West Side Bank (1906)The New York Architect, Volume 4, Issue 2, 1910 St. Brendan's Church, Williamsbridge (1906).American Architect and the Architectural Review, Volume 89, p. 161 Immaculate Conception Church (1908) in Tuckahoe. St. Francis Friary, Manhattan (1909)Architects' and Builders' Magazine, Volume 41, W.T. Comstock, 1909, p. 363 Incarnation School (Manhattan) (1909).Architecture and Building: 1910/1911, Volume 43, W.T. Comstock Company, 1911.p. 632 St. Lucy's Church (1914–15) on East 104th Street in Manhattan."Church of St. Lucy", NYC AGO Saint Malachy's Roman Catholic Church on West 49th Street in Manhattan, Chapel of Saint Genesius (patron saint of actors) 1920.Thagard, Gavin and Sara, Marian. "St. Malachy's: The Actors' Chapel." Clio: Your Guide to History. May 5, 2017 Rectory of St. Cecilia Parish (1927) at 125 East 106th Street in Manhattan.

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