Thornton Fitzhugh (1864–1933)^[1] was an American architect.^[2] Among his major works are the Beaux Arts and Romanesque Pacific Electric Building in downtown Los Angeles, California, and a number others which are listed on the U.S. National Register of Historic Places.^[3]

For part of his career he worked in a partnership, Fitzhugh, Krucker and Deckbar.

Works include:^[4]

• Pacific Electric Building, (1902–1904), 610 S. Main St., downtown Los Angeles, CA
• Highland Park Presbyterian Church #1, (1903), Highland Park neighborhood, Los Angeles, CA
• Mayfair Apartments, (1906), Los Angeles, CA
• Bank of Highland Park Building, (1906), Highland Park neighborhood Los Angeles, CA
• Mrs. J.H. Newell and Miss Anna B. Clarkson House, (1907), Los Angeles, CA
• S.R. Jordan House, (1908) Venice neighborhood, Los Angeles, CA
• Watkins and Belden Hotel Project, (1913), Los Angeles, CA
• Trinity Auditorium Building, (1911–1914), Los Angeles, CA
• Rialto Pacific Electric Station, (1914–1915), Rialto, CA
• Cooper Arms Apartments, (1923), Long Beach, CA
• G.E. Noll Building, Phoenix, Arizona, NRHP-listed
• Glendale Woman's Club Clubhouse, 7032 N. 56th Ave. Glendale, Arizona, NRHP-listed
• First Presbyterian Church (San Luis Obispo, California) (1904)

His brother Lee Mason Fitzhugh was also a noted architect who designed the First United Methodist Church, Glendale, AZ^[5]