Arnold William Brunner (September 25, 1857 – February 14, 1925) was an American architect who was born and died in New York City.

He was a Fellow of the American Institute of Architects after 1892 and was appointed by Theodore Roosevelt to the United States Commission of Fine Arts in Washington, D.C.

[1] No attempt was made to convey an "eastern" vocabulary, as was often being done for other Jewish congregations: Brunner and Tryon provided a forthright Roman Baroque temple with a projecting three-bay center that contrasts with the windowless ashlar masonry flanking it and contains a recessed loggia entrance under three large arch-headed windows, articulated by a colossal order of Corinthian columns surmounted by a pediment over a paneled attic frieze.

[2]: 270 Students' Hall at Barnard College was built in 1916 and listed on the National Register of Historic Places in 2003.

Brunner also designed the U.S. Post Office, Custom House and Courthouse (1910) in the Group Plan conceived by Daniel Burnham, John Carrère, and Brunner in 1903 to create a new urbanistic center for Cleveland, Ohio, which was a rare realisation of a "City Beautiful" plan.