From List of National Natural Landmarks, these are the National Natural Landmarks in Oklahoma. There are 3 in total, X are lakes or pond, Y are forests, Z are other.
| Name | Image | Date | Location | County | Description | |
|---|---|---|---|---|---|---|
| 1 | Devil's Canyon | December 1974 | Canadian | Known for several different mesic plants in a diverse environment of oak woodland/tall prairie grass and eastern deciduous forest | ||
| 2 | McCurtain County Wilderness Area | December 1974 | Broken Bow | McCurtain | A 14,087 acres (57.01 km2) wilderness nature preserve since 1918. It is an excellent example of a xeric upland oak-pine forest | |
| 3 | Salt Plains National Wildlife Refuge | June 1983 | Jet | Alfalfa | A 32,000-acre (130 km2) National Wildlife Refuge, it is a critical habitat for 75% of the endangered Whooping Crane population. |
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