Buccinulum wairarapaense is an extinct species of marine mollusc gastropod in the family Tudiclidae. Fossils of the species date to the Pleistocene in New Zealand, and the species likely lived in deep waters.
In the original description, Powell described the species as follows:
The holotype of the species has an estimated height of and a diameter of . It can be differentiated from B. colensoi due to its stronger axial sculpture, spiral sculpture and concave shoulder, and from B. pertinax finlayi due to its more prominent sculpture.
The species likely lived on the outer shelf or deep waters.
The species was first described by A.W.B. Powell in 1938, who used the name Buccinulum (Euthrena) wairarapaensis. While Buccinulum wairarapaensis has been used as the accepted name in New Zealand texts, the World Register of Marine Species uses the spelling Buccinulum wairarapaense. Closely related to B. colensoi, Winston Ponder considered two possibilities for the species: that it represents a population separate from B. colensoi that lived on the east coast of the North Island and eastern Cook Strait that became extinct, or that B. colensoi is a hybrid species produced by the interbreeding of B. wairarapaense with B. vittatum.
The holotype was collected in either 1924 or 1927 by A. W. B. Powell, from lighthouse reef, Castlepoint, Wairarapa, New Zealand, and is held by the Auckland War Memorial Museum.
This extinct marine species occurs in Pleistocene (Nukumaruan stage) of New Zealand, dating to 2.40 million years before the present, including the Castlepoint Formation and the Haumuri Bluff of the southern Kaikà Âura District.