Hans Otto Friedrich Schlossberger (born 22 September 1887 in Alpirsbach, died 27 January 1960 in Stuttgart) was a German physician, who was known for his research in immunology, medical microbiology, epidemiology and antimicrobial chemotherapy, especially on syphilis, typhus, gas gangrene, diphtheria, erysipeloid of Rosenbach, tuberculosis, malaria and leptospirosis.