| Miss Indian America Pageant | Gregory Nickerson |
| Mission 66 in Yellowstone and Grand Teton Parks | John Clayton |
| Missionaries, German Lutheran | James H. Nottage |
| Mitchell Peak | |
| Mitchell, Finis, Wind River Mountains hiker and conservationist | Rebecca Hein |
| Mni Akuwin, Spotted Tail’s daughter | Tom Rea |
| Modernization in Wyoming’s national parks | John Clayton |
| Monumental Cemetery, Cremona, Italy | |
| Moonlight, Thomas | Wyoming State Archives |
| Moore, Lucy Morrison | John Clayton |
| Morgan, Elliot | Wyoming State Archives |
| Mormon Colonizers, Bighorn Basin | Darcee Barnes |
| Mormon ferry, North Platte River | WyoHistory.org |
| Mormon Handcart Visitors Center | |
| Morris, Alice | Robert G. and Elizabeth L. Rosenberg |
| 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 | |
| Murie Family, the: Wilderness Leaders in Wyoming | Emilene Ostlind |
| Murie, Adolph | Emilene Ostlind |
| Murie, Louise | Emilene Ostlind |
| Murie, Mardy | Emilene Ostlind |
| Murie, Olaus | Emilene Ostlind |
| Museum at the Big Horns | |
| Museum of the American West | |
| Museum of the Fur Trade | |
| Museum of the Mountain Man | |
