| Crook County Museum and Art Gallery | Field Trips | |
| Crook County, Wyoming | Encyclopedia | Nicole Lebsack |
| Crook, Gen. George Campaign sign | Field Trips | |
| Crook, Gen. George, campaigns of 1876 | Encyclopedia | Lori Van Pelt |
| Crossings, North Platte River; Oregon Trail sites of | Encyclopedia | WyoHistory.org |
| Crow Creek Ranch | Encyclopedia | Stephanie Lowe |
| Curry, Peggy Simson, Wyoming Poet Laureate 1981-1987 | Encyclopedia | Lori Van Pelt |
| Dana, Wyo., Black coal miners in | Encyclopedia | Brigida R. (Brie) Blasi |
| Daniel Lantz grave | Field Trips | |
| Daniel Lantz grave | Encyclopedia | Randy Brown |
| Dansie, Charlotte, pioneer grave of | Encyclopedia | Randy Brown |
| David, Bob in World War I | Encyclopedia | Tom Rea |
| Davison, Kathy, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Dawes General Allotment Act, 1887 | Encyclopedia | WyoHistory.org |
| Dayton, Janel, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Dayton, Wyo. | Field Trips | |
| De Smet, Father in Wyoming | Encyclopedia | Rebecca Hein |
| De Smet, Father monument of first Cathollic mass | Field Trips | |
| Deer Creek Stage Station | Field Trips | |
| Deming, W. Edwards | Encyclopedia | Doug McInnis |
| Devil's Gate Interpretive Site | Field Trips | |
| Devils Tower | Encyclopedia | WyomingHeritage.org |
| Devils Tower National Monument | Field Trips | |
| Devil’s Gate | Encyclopedia | Wyoming State Historic Preservation Office |
| Diamond Hoax, 1872 | Encyclopedia | Dick Blust, Jr. |
| Diamond L. “Slim” Clifton site | Field Trips | |
| Dick Cheney Alumni Field | Field Trips | |
| Dick Cheney Federal Building | Field Trips | |
| Dickinson, Anna, speaks in Cheyenne, 1869 | Encyclopedia | Tom Rea |
| Dinosaurs | Encyclopedia | Annette Hein |
| Dixon, Joseph K. | Encyclopedia | Johanna Wickman |
| Douglas Railroad Interpretive Center | Field Trips | |
| Downey, June Etta, longtime University of Wyoming psychology professor | Encyclopedia | Rebecca Hein |
| Downey, Stephen Wheeler | Encyclopedia | Tyler Eastman |
| Driving Tour of Wyoming’s western boundary | Field Trips | |
| Dry Farming | Encyclopedia | Carl V. Hallberg |
| Dry Sandy Crossing | Encyclopedia | WyoHistory.org |
| Dubois Museum | Field Trips | |
| Dude ranching, history of in Wyoming | Encyclopedia | John Clayton |
| Dull Knife Fight, 1876 | Encyclopedia | Gerry Robinson |
| Durand, Earl, Park County poacher and bank robber | Encyclopedia | Lillian Turner |
| Durlacher House | Field Trips | |
| Durlacher House | Encyclopedia | Stephanie Lowe |
| Earhart, Amelia, Wyoming connections of | Encyclopedia | Lori Van Pelt |
| Eastern Shoshone Tribe, 1905 Land Cession Agreement | Encyclopedia | WyoHistory.org |
| Eastern Shoshone, two Fort Bridger treaties with | Encyclopedia | WyoHistory.org |
| Eclipses, solar | Encyclopedia | Rebecca Hein |
| Ecoffey family and 1868 wagon train attack | Encyclopedia | Rebecca Hein |
| Edison, Thomas in Wyoming Territory | Encyclopedia | Phil Roberts |
| Eisenhower, Dwight and 1919 transcontinental motor convoy | Encyclopedia | Lori Van Pelt |
