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.

[2] The genus is endemic to the islands of Maui and Molokai, Hawaii.

[2] Henry Augustus Pilsbry and Charles Montague Cooke, Jr. (1912-1914)[3] is the most recent and accepted taxonomy for this genus.

[2] Species within the genus Newcombia include: †=extinct This article incorporates public domain text from the reference[2]