The taxon authority Hassler may refer to:
- Arne Hässler (1904-1952), botanist
- Emil Hassler (1864–1937, Hassl.), Swiss physician, naturalist and botanist, also published as "Émile Hassler" and "Emilio Hassler"
- Michael Hassler, German botanist
- William Grey Hassler (Hassler), U.S. zoologist and herpetologist
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