Otto Haas
Otto Haas is the name of the following people:
- Otto Haas (officer) (1864–1930), German officer
- Otto Haas (industrialist) (1872–1960), German industrialist
- Otto Haas (antiquarian) (1874–1955), German-British antiquarian
- Otto Haas (paleontologist) (1887–1976), Austrian paleontologist
- Otto Haas (linguist) (1911–1977), Austrian linguist
- Otto Haas (racing driver) , German motorcycle racer
- Otto Bang-Haas (1882–1948), German entomologist and insect dealer
- Otto Ludwig Haas-Heye (1879–1959), German fashion designer and university professor
- Otto Rudolf Haas (1878–1956), German steel industrialist
