| MacKinnon, Anne, Casper Star-Tribune reporter and editor | Kerry Drake |
| Magill, Ada, Oregon Trail grave of | WyoHistory.org |
| Marbleton, Wyoming | Ann Chambers Noble |
| Marking historic sites, history of in Wyoming | Kylie Louise McCormick, The Wyoming Monuments and Markers Program |
| Martin, Joe, lynching of | Kim Viner |
| Martin’s Cove, events of 1856 | Annette Hein |
| Martin’s Cove, Mormon Church Acquisition of | Annette Hein |
| Mathew Campfield Park | |
| Matthew Shepard memorial bench | |
| Maynardier, Col. Henry E., Fort Laramie commander | Tom Rea |
