| Official Name: | Alderdale, Washington |
| Pushpin Map: | Washington#USA |
| Pushpin Label: | Alderdale |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Washington |
| Subdivision Type2: | County |
| Subdivision Name2: | Klickitat |
| Established Title: | Established |
| Established Date: | 1907 |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Coordinates: | 45.8347°N -119.9208°W |
| Postal Code Type: | ZIP code |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
Alderdale is an extinct town in Klickitat County, in the U.S. state of Washington. The GNIS classifies it as a populated place.
A post office called Alderdale was established in 1907, and remained in operation until 1962.[1] In 1917 it was reported as a station on the Spokane, Portland and Seattle Railway.[2] The community took its name from nearby Alder Creek.[3]