William E. Haugaard (1889 – September 1948) was an American architect who served as the State Architect for the State of New York from 1928 to 1944. A number of his works have been listed on the National Register of Historic Places.
Haugaard obtained degrees from the School of Architecture at Pratt Institute in 1908 and later studied at the Massachusetts Institute of Technology. From 1913 to 1918, he worked in Panama and designed a number of buildings in the Canal Zone, and assisted in design of the Gorgas Hospital. From 1920 to 1928, he was a member of the firm of Haugaard & Burnham in New York City.
In February 1928, Haugaard was appointed as the State Architect for the State of New York. He served as State Architect from 1928 until 1944 and designed numerous state office buildings, prisons, hospitals, and schools, including Attica State Prison. His works included a dozen armories during that period.
Haugaard resigned as State Architect in January 1944, after 16 years of service. Haugaard announced at the time that he sought to return to a private architecture practice. At the time of his resignation, Haugaard estimated that $250 million of the State of New York's $450 million investment in public buildings had been expended during his 16 years in office.
In 1947 he became Chief of Planning for the New York City Housing Authority.
- Attica State Prison
- Binghamton Armory, built 1932-1934
- Masten Avenue Armory (Buffalo), built 1932-1933
- New York State College of Human Ecology Martha Van Rensselaer Hall, built 1933, 116 Reservoir Ave, City of Ithaca, Tompkins, New York 
- Corning Armory, built 1935-1936, at 127 Centerway, Corning, New York, NRHP-listed
- Green Haven State Prison, Poughkeepsie, New York
- Halloran General Hospital, later known as Willowbrook State School, Staten Island
- Hawkins Hall, Beekman St., Plattsburgh, New York
- Jamestown Armory, 1932, at 34 Porter Ave., Albany, New York, NRHP-listed
- Kingstown Armory, 1932
- Newburgh Armory, 1932
- Oneida Armory, 1930, 217 Cedar St., Oneida, New York, NRHP-listed
- Peekskill Armory, 1932
- Schenectady Armory, 1936, 125 Washington Ave., Schenectady, New York, NRHP-listed
- Syracuse Armory, 1941-1943
- Transit Authority Headquarters (1951), 370 Jay Street, Brooklyn, originally Board of Transportation Building (William E. Haugaard & Andrew J. Thomas).
- Utica Armory, 1930, 1700 Parkway Blvd. E., Utica, New York, NRHP-listed
- Ticonderoga Armory, 1935, at 315 Champlain Ave., Ticonderoga, New York, NRHP-listed
- Alfred E. Smith Building, Albany, New York
- "Haugaard Is Named As State Architect". The New York Times. February 12, 1928.
- "Haugaard Quits" (PDF). Albany NY Knickerbocker News. January 6, 1944.
- "The State Architect". The New York Times. February 14, 1928.
- "W.E. Haugaard, 59, Long an Architect". New York Times. September 18, 1948.
- Nancy L. Todd (December 2002). "National Register of Historic Places Registration: Corning Armory". New York State Office of Parks, Recreation and Historic Preservation. Retrieved 2009-06-14. See also: "Accompanying seven photos".
- Army National Guard Armories in New York State MPS
- "Quits Architecture Post: W. E. Haugaard Has Served as State Commissioner 16 Years". The New York Times. January 8, 1944.
- Carl Ballenas and Nancy Cataldi (2002). Richmond Hill. Arcadia Publishing.
- National Park Service (2009-03-13). "National Register Information System". National Register of Historic Places. National Park Service.
- Federal Writers Project (2013). The WPA Guide To New York : The Empire State. San Antonio: Trinity University Press. ISBN 9781595342300.
- "A Preservationist's List of 35 Modern Landmarks-in-Waiting". The New York Times. November 17, 1996.