| Official Name: | Iantha, Missouri |
| Settlement Type: | Census-Designated Place |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Barton |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.70 |
| Area Land Km2: | 0.70 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.27 |
| Area Land Sq Mi: | 0.27 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 95 |
| Population Density Km2: | 135.60 |
| Population Density Sq Mi: | 351.85 |
| Elevation Ft: | 988 |
| Blank Name: | FIPS code |
| Blank Info: | 29-34192 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2806381 |
Iantha is an unincorporated community and census designated place in Barton County, Missouri. It is located six miles west of Lamar.
Iantha was founded in 1881.[2] The community most likely was named after an early settler.[3] A post office called Iantha was established in 1881, and remained in operation until 1885.[4]