There are 8 National Natural Landmarks in Iowa.
| Name | Image | Date | Location | County | Ownership | Description |
|---|---|---|---|---|---|---|
| 42.3156°N -93.6239°W | Private | One of the few essentially natural glacial pothole lakes remaining in Iowa. | ||||
| 43.3972°N -95.2439°W | State | An example of the increasingly rare virgin prairie grassland. | ||||
| 43.4411°N -91.9603°W | Private | An exceptional example of an extensive cave system well decorated with speleothems. | ||||
| State | Pothole lakes created during the last glacial epoch. | |||||
| 43.4395°N -92.3831°W | State | A true prairie remnant. | ||||
| 41.8013°N -95.995°W | State, private | The best examples of loess topography in the Missouri River Bluffs region. | ||||
| 42.6297°N -91.1121°W | State | The only known remaining white pine tract in Iowa. | ||||