List of National Natural Landmarks in Arkansas
There are 5 National Natural Landmarks in Arkansas. Four are forests and one is a spring.
| Name | Image | Date | Location | County | Ownership | Description |
| Big Lake Natural Area | Mississippi | Federal | Forest area within Big Lake National Wildlife Refuge. | |||
| Lake Winona Research Natural Area | Saline | Federal | Pine forest near Lake Winona (Arkansas); part of Ouachita National Forest. | |||
| Mammoth Spring | Fulton | State | The largest first magnitude spring in Arkansas, it is connected underground to the Grand Gulf State Park in Missouri. | |||
| Roaring Branch Research Natural Area | Polk | Federal | Steep ravine with a virgin forest in Ouachita National Forest. | |||
| White River Sugarberry Natural Area | Desha | Federal | Virgin hardwood bottomland forest in White River National Wildlife Refuge. |