Arthur Loomis Harmon (July 13, 1878 – October 17, 1958) was an American architect.

He is most famous as the design partner of the firm Shreve, Lamb and Harmon.

He was born in Chicago in 1878[1] and graduated from Columbia University's School of Architecture in 1901.

He was elected into the National Academy of Design as an Associate member in 1935 and became a full Academician in 1944.

[4] Personally, he also designed several buildings of relative fame, namely the Jerusalem International YMCA,[5] Allerton 39th Street House,[6] Shelton Hotel (currently the New York Marriott East Side),[7] and Warburton House.