Helastia salmoni is a moth of the family Geometridae. This species is endemic to New Zealand and is found only in Fiordland in the South Island. Adults of this species are on the wing in January and are nocturnal and attracted to light. Although similar in appearance to Helastia corcularia, H. salmoni can be distinguished as its forewings are a lighter white-grey. This species was named in honour of John Salmon.

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