| Official Name: | Smithsonia, Alabama |
| Pushpin Map: | Alabama#USA |
| Pushpin Label: | Smithsonia |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Alabama |
| Subdivision Type2: | County |
| Subdivision Name2: | Lauderdale |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 512 |
| Coordinates: | 34.7942°N -87.8792°W |
| Area Code: | 256 & 938 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 157080 |
Smithsonia, also known as Cave Springs, is an unincorporated community in Lauderdale County, in the U.S. state of Alabama.
Smithsonia was originally known as Cave Springs, in reference to the numerous caves in the surrounding area. It was then named Smithsonia, in honor of Columbus Smith, a landowner and merchant following the American Civil War.[1] Smith operated a ferry, general store, grist mill, and cotton gin in Smithsonia.[2] A post office was in operation under the name Smithsonia from 1886 to 1927.[3]