Juga is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Semisulcospiridae.

These snails are native to the rivers of the northwestern United States and adjacent British Columbia.

[2] The most abundant and widespread species, Juga plicifera, attains a height of up to 35 mm.

It is sculpted with fine spiral ridges and variably developed ribs that frequently disappear in parts of the shell made as the animal matures.

include the bacterium Neorickettsia risticii, which causes Potomac horse fever along with the associated trematode vector.