Gustav A. Hanssen (November 22, 1869 - January 4, 1944) was an American architect. He designed private residences in Davenport, Iowa and later moved to San Diego, California. Several of his buildings are listed on the National Register of Historic Places (NRHP).
Hanssen graduated from the University of Illinois Urbana-Champaign in 1890, where he played on the Fighting Illini baseball team."Illinois Baseball All-Time Rosters - 1879-1899", fightingillini.com website, University of Illinois, 2026. Retrieved 24 July 2026.
Works Sacred Heart Cathedral Rectory, Davenport, Iowa (1895); NRHP-listed with John C. Schricker House, Davenport, Iowa (1896); NRHP-listed Buffalo High School, Buffalo, Iowa (1900); NRHP-listed with Central Fire Station (Davenport, Iowa), Davenport, Iowa (1901); NRHP-listed with E.A. Shaw House, Davenport, Iowa (1901); NRHP-listed with Walsh Flats/Langwith Building, Davenport, Iowa (1910); NRHP-listed with One or more buildings in the Oak Lane Historic District, Davenport, Iowa; NRHP-listed with One or more buildings in the Riverview Terrace Historic District, Davenport, Iowa; NRHP-listed with One or more buildings in the Vander Veer Park Historic District, Davenport, Iowa; NRHP-listed with Yuma County Courthouse, Yuma, Arizona (1928; with Ralph Swearingen); NRHP-listed With
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