Hobart Ansteth Reimann (1897–1986) was an American virologist and physician. Reimann made contributions to medicine with his 1938 landmark article on atypical pneumonia (the "first description of virus pneumonia"); and articles on periodic disease and the common cold (1948). He was active in the testing of streptomycin against typhoid, with "the first publicly reported successful experiments." Post WWII, he was one of the early voices to speak against the overuse of and misuse of antibiotics, and he testified before the US Senate on this subject in the early 1960s.