Mecodema howitti (syn. Mecodema rectolineatum, Mecodema walkeri), termed the large Banks Peninsula ground beetle, is a carnivorous forest ground beetle in the genus Mecodema. It is endemic to Banks Peninsula, Canterbury, New Zealand, and is the largest of the 16 carabids found in the area.

There are very limited records, and in general there is little ecological knowledge about this species. M. howitti is listed as threatened, range-restricted, and sparse within Banks Peninsula, however the Department of Conservation has been prevented from ranking this species as a priority threatened species due to the lack of ecological information available.

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