Arnold Spuler (1 June 1869, Durmersheim – 15 March 1937, Aidenried, Upper Bavaria) was a German physician, an entomologist and a politician.
After attending the gymnasium in Karlsruhe, Spuler was drafted in the 30th Regiment of Field Artillery of Baden (XIV Corps of the German Empire) from 1887 to 1888.
He then studied natural sciences and medicine in Freiburg im Breisgau and Berlin.
After the war he enrolled in the German National People's Party (DNVP).
Spuler wrote treatises on anatomy, ontogeny, biology and zoology, and books on Lepidoptera.