Thomas Phifer (born 1953 in South Carolina) is an American architect based in New York City.

[6] Phifer designed the new Museum of Modern Art in Warsaw, located on the northern side of Plac Defilad next to the Palace of Culture and Science.

[15] That year, his Hudson Valley House II won a Architecture Honor Award from the New York Chapter of the AIA.

[18] In 2020, Phifer's Corning Museum of Glass expansion won a National Honor Award for Interior Architecture from the AIA.

[3] The San Francisco Chronicle's architecture critic John King described Phifer as "a master of meticulous modernism who has won praise for gem-like private homes and such cultural facilities as [the 2015] addition to the Corning Museum of Glass", but criticized 222 Second Street (completed by Tishman Speyer in 2016) as "designed and built by New Yorkers" without taking the building's San Francisco surroundings into account.