Gymnodoris arnoldi is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae. It was first described in 1957.Burn, R.F. (1957) A list of the dorid nudibranchs of Australia (Gastropoda, Opisthobranchia). Journal of Zoology, London, 176: 477-517.
Distribution This species is known from southeastern Australia.
Description Gymnodoris arnoldi has an orange-red body with translucent white rhinophores.
Ecology This species eats colonial ascidians.
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