Hadramphus stilbocarpae, commonly known as the knobbled weevil, is a species of weevil endemic to New Zealand. It was first described by Guillermo Kuschel in 1971. H. stilbocarpae occur on Snares Island, Stewart Island a few islands in Fiordland. As larvae, they feed on the rhizomes of plants such as those in the Azorella genus. Under the New Zealand Threat Classification System, this species is listed as "Relict" with the qualifiers of "Range Restricted". They are threatened by predation from introduced rats.

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