Yonna, Oregon

Yonna is an unincorporated community in Klamath County, Oregon, United States. It lies east of Oregon Route 140 in Yonna Valley, northeast of Dairy and near the base of Short Lake Mountain.

At one time known as Alkali Valley, the area is now known by its Klamath name, Yonna Valley. According to Oregon Geographic Names, the name may come from yana, meaning "below" as in the valley, or it may derived from yaina, meaning "mountain" There's also a local tradition that yonna in some tribal language means alkali, and so the change was made to avoid discouraging people who might otherwise want to settle there.

A post office was established in Yonna Valley in 1906. It closed in 1913.