| Title | Author |
|---|---|
| Morris, Esther Hobart | Abby Dotterer |
| Mother Featherlegs monument | |
| Mount Washburn, Yellowstone National Park | |
| Mountain Shoshone | Rebecca Hein |
| Mountain View Historic Hotel & Café | |
| Mountain View Hotel | Wyoming State Historic Preservation Office |
| Muir, John in Yellowstone | John Clayton |
| Mummy Cave | |
| Murals, Casper Army Air Base | Eric Wimmer |
| Murie Center |