Neoguraleus sinclairi is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

[1] Not to be confused with Neoguraleus sinclairi (E.A.Smith, 1884) (synonym of Neoguraleus finlayi Powell, 1942).

Tucker (2004) states that Drillia sinclairi Gillies, 1882is a nude name, but it is not; Gillies (1882) renamed a misidentification by Hutton (1880), referring to p. 45 where Hutton gave a description of "Defranchia luteo-fasciata".

This marine species is endemic to New Zealand and occurs throughout New Zealand and at the Steward Island and the Chatham Islands; fossils have been found in Pliocene strata.

This Mangeliidae-related article is a stub.