Arnoldi
The taxon authority Arnoldi may refer to:
- Konstantin Vladimirovich Arnoldi — Russian entomologist (1901—1982), son of Wladimir Mitrofanowitsch Arnoldi and brother of Lev Vladimirovich Arnoldi
- Lev Vladimirovich Arnoldi — Russian entomologist (1903—1980), son of Wladimir Mitrofanowitsch Arnoldi and brother of Konstantin Vladimirovich Arnoldi
- Wladimir Mitrofanowitsch Arnoldi — Russian botanist (1871—1924)