Christinus guentheri is a species of lizard in the family Gekkonidae (geckos). The species is endemic to two Australian islands, Norfolk Island and Lord Howe Island.
C. guentheri has the common names Günther's island gecko, Lord Howe Island gecko, and Lord Howe Island southern gecko.
The specific epithet, guentheri, commemorates German-born British zoologist Albert Günther.
C. guentheri is listed as vulnerable by the IUCN, and by the Australian government's EPBC act.