Hans Wilhelm Auer (26 April 1847 – 30 August 1906) was a Swiss-Austrian architect best known for his design of the Swiss Bundeshaus (1894–1902) in Bern.
Auer was born in Wädenswil. A pupil first of Gottfried Semper at the ETH Zurich and then staff assistant for Theophil Hansen in Vienna, Auer established his own office in 1887 and enjoyed a rich and varied career as a practicing architect, educator, and theorist. He died at Konstanz.