Prestonella is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Bothriembryontidae.

Prestonellidae (as a not available name) was tentatively placed as a synonym of Aillyidae in the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. Prestonella is the type genus of the family Prestonellidae, but Prestonellidae is not an available name, because it has no diagnosis. Prestonella was considered as the only genus in the family Prestonellidae.^{[citation needed]}

Herbert (2007) has classified Prestonella in Bulimulidae sensu lato within Orthalicoidea.

Herbert & Mitchell (2009) have classified Prestonella, for which the phylogenetic relationships were previously unknown, in the superfamily Orthalicoidea.

Breure et al. (2010) moved Prestonella to Placostylidae, that Breure & Romero (2012) renamed to Bothriembryontidae.

Prestonellinae was formally described as a new subfamily within Bothriembryontidae in 2016. Prestonellinae contains three genera: Prestonella Connolly, 1929, Discoleus Breure, 1978 and Plectostylus Beck, 1837. Prestonella is the type genus of the subfamily Prestonellinae.

This genus is endemic to South Africa and Lesotho. It occurs in the southern edge of the Great Escarpment in southern Africa.

Prestonella has a relict distribution in the south of the southern Africa and it is the only Recent African member of Bulimulidae s.l. Its distribution is highly fragmented.