Mesodon clenchi)[1] is a species of land snail in the family Polygyridae.

It is endemic to Arkansas in the United States.

[2] Its common names include Calico Rock oval,[2][3] Clench's middle-toothed land snail, and Mission Creek Oregonian.

[1] The snail occurs in leaf litter in rocky cliff and rockslide habitat.

[1] The species was named for the American malacologist William J. Clench.