Escherichia hermannii is a Gram-negative, rod-shaped species of bacterium. Strains of this species were originally isolated from human wounds, sputum, and stool. The species is named for American microbiologists George J. Hermann and Lloyd G. Herman. A 2016 publication proposed reclassifying E. hermannii as a species of a new genus within the Enterobacteriaceae, Atlantibacter, a change which would rename the species to Atlantibacter hermannii.