| Official Name: | Yonna, Oregon |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Oregon#USA |
| Pushpin Label: | Yonna |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oregon |
| Subdivision Type2: | County |
| Subdivision Name2: | Klamath |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 4144 |
| Coordinates: | 42.2681°N -121.4675°W |
| Postal Code Type: | ZIP code |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1161605[1] |
| Footnotes: | Coordinates and elevation from Geographic Names Information System |
Yonna is an unincorporated community in Klamath County, Oregon, United States.[1] It lies east of Oregon Route 140 in Yonna Valley, northeast of Dairy and near the base of Short Lake Mountain.[2]
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.[3]