| Dickinson, Anna, speaks in Cheyenne, 1869 | Tom Rea |
| Dinosaurs | Annette Hein |
| Dixon, Joseph K. | Johanna Wickman |
| Douglas Railroad Interpretive Center | |
| Downey, June Etta, longtime University of Wyoming psychology professor | Rebecca Hein |
| Downey, Stephen Wheeler | Tyler Eastman |
| Dry Farming | Carl V. Hallberg |
| Dry Sandy Crossing | WyoHistory.org |
| Dubois Museum | |
| Dude ranching, history of in Wyoming | John Clayton |
| Dull Knife Fight, 1876 | Gerry Robinson |
| Durand, Earl, Park County poacher and bank robber | Lillian Turner |
| Durlacher House | |
| Durlacher House | Stephanie Lowe |
| Earhart, Amelia, Wyoming connections of | Lori Van Pelt |
| Eastern Shoshone Tribe, 1905 Land Cession Agreement | WyoHistory.org |
| Eastern Shoshone, two Fort Bridger treaties with | WyoHistory.org |
| Eclipses, solar | Rebecca Hein |
| Ecoffey family and 1868 wagon train attack | Rebecca Hein |
| Edison, Thomas in Wyoming Territory | Phil Roberts |
| Eisenhower, Dwight and 1919 transcontinental motor convoy | Lori Van Pelt |
| Elizabeth Cumming | Rebecca Hein |
| Elizabeth Paul Grave | |
| Elk Basin Oil Field | Rebecca Hein |
| Elk Mountain Hotel | Lori Van Pelt |
| Elk Mountain Hotel | |
| Elk Mountain Museum | |
| Ellis, Frank “Pinky” on the sheep business, small-town politics and family life | Casper College Western History Center |
| Emerson, Frank | Wyoming State Archives |
| Emigrant Gap | |
| Emigrant Gap, Oregon Trail site of | WyoHistory.org |
| Emigrant Hill, Oregon Trail site | Randy Brown |
| Emigrant Spring, Oregon Trail Slate Creek Cutoff site | Randy Brown |
| Empire, Wyoming, African-American community of | Robert Galbreath |
| Encampment, Wyoming | Lori Van Pelt |
| Energy Transportation Systems, Inc. coal slurry pipeline | Dan Whipple |
