There are National Natural Landmarks in Montana.
| Name | Image | Date | Location | County | Ownership | Description |
|---|---|---|---|---|---|---|
| federal (Bureau of Land Management) | Contains fossils of Deinonychus antirrhopus. | |||||
| 47.683°N -106.2192°W | federal (Charles M. Russell National Wildlife Refuge) | Produced abundant remains of small, Cretaceous mammals. | ||||
| 45.5958°N -104.1201°W | federal (Custer National Forest) | A remnant of the once continuous blanket of Tertiary deposits that covered much of the Great Plains. | ||||
| tribal land (Crow Nation) | Contains early Cretaceous vertebrate fossils. | |||||
| 46.9389°N -114.1436°W | private | Contains the best examples of giant flood ripples in the North American continent. | ||||
| 46.15°N -107.48°W | Several | mixed- state, private | The type locality for Tyrannosaurus rex, Ankylosaurus magniventris, and Brachychampsa fontana fossils. | |||
| 48.4681°N -104.3817°W | federal (Medicine Lake National Wildlife Refuge) | An exceptional example of the processes of continental glaciation, including till, outwash, eskers, kames, and terrace deposits. | ||||
| 46.1317°N -111.1098°W | federal (Bureau of Land Management) | An outstanding example of a canyon cut across the grain of the geologic structure by a superposed stream. | ||||
| 44.6303°N -111.7814°W | federal | A series of relatively undisturbed, high-altitude ecosystem types representative of pre-European settlement conditions. | ||||
| 47.4765°N -110.242°W | federal (Bureau of Land Management) | One of the best examples of banded magmatic rock in the United States. | ||||