Saltonia is a genus of spiders with the sole species Saltonia incerta, a rare spider only known from California, United States, where it occurs on the shores of the Salton Sea, among salt-crusts in several dry or intermittent lake-beds, and from a small island in the Gulf of California. All of the few collected specimens were collected during March and April near salt springs, salt water or salt marshes. Its colulus is similar to that of two genera of intertidal zone spiders of the family Desidae, Paratheuma and Desis. Genetic evidence suggests it is closely related to Paratheuma and the fully aquatic species Argyroneta aquatica.