Newcombia is a genus of tropical tree-living air-breathing land snails, arboreal pulmonate gastropod mollusks in the family Achatinellidae.

The Hawaiian tree snail genus Newcombia is a member of the family Achatinellidae and the endemic Hawaiian subfamily Achatinellinae. The genus is endemic to the islands of Maui and Molokai, Hawaii. Six of the known species were endemic to Molokai (Newcombia canaliculata, Newcombia lirata, Newcombia perkinsi, Newcombia pfeifferi, Newcombia philippiana, and Newcombia sulcata), and only one species, Newcombia cumingi, is known from the island of Maui. Henry Augustus Pilsbry and Charles Montague Cooke, Jr. (1912-1914)Pilsbry H. A. & Cooke C. M. Jr. (1912-1914). Achatinellidae. Manual of Conchology (2)21. is the most recent and accepted taxonomy for this genus.

Species Species within the genus Newcombia include: Newcombia canaliculata Baldwin, 1905 Newcombia cumingi Sykes, 1896 Newcombia lirata Mighels, 1912 (†) Newcombia perkinsi Sykes, 1896 (†) Newcombia pfeifferi Newcomb, 1853 Newcombia philippiana Pfeiffer, 1850 (†) Newcombia sulcata Pfeiffer, 1857 (†)

References This article incorporates public domain text from the referenceWada L. (2008). "U.S. FISH AND WILDLIFE SERVICE SPECIES ASSESSMENT AND LISTING PRIORITY ASSIGNMENT FORM. SCIENTIFIC NAME: Newcombia cumingi". Pacific Islands Fish & Wildlife Office. 13 pp. PDF.