| Keyes, Verna | Encyclopedia | Kylie Louise McCormick |
| Keyhole State Park | Field Trips | |
| King, Jamie Buckley, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| King, Martin Luther, assassination of and Wyoming editorials | Encyclopedia | Phil White |
| Kirwin Inspired Dreams of Prosperity, Solitude | Encyclopedia | Lori Van Pelt |
| Kirwin, Wyo. | Encyclopedia | Lori Van Pelt |
| Kirwin, Wyoming | Field Trips | |
| Knight Hall, University of Wyoming | Field Trips | |
| Knight, Emma Howell | Encyclopedia | Alexandra Hullinger |
| Knight, Samuel H. | Encyclopedia | Alexandra Hullinger |
| Knob Hill | Encyclopedia | WyoHistory.org |
| Kortes Dam | Field Trips | |
| Kortes Dam, History of | Encyclopedia | Annette Hein |
| L Slash Heart Ranch | Field Trips | |
| La Prele Creek, Oregon Trail crossing of | Encyclopedia | WyoHistory.org |
| Lake De Smet and Father De Smet Monument | Field Trips | |
| Lamoreaux family and 1868 wagon train attack | Encyclopedia | Rebecca Hein |
| Lance Creek Oil Field | Encyclopedia | Rebecca Hein |
| Lander Trail | Encyclopedia | Terry A. Del Bene |
| Lander Trail | Field Trips | |
| Lander Trail, New Fork River Crossing | Encyclopedia | Clint Gilchrist |
| Lantz, Daniel, 1850 emigrant grave of | Encyclopedia | Randy Brown |
| Laramie County, Wyoming | Encyclopedia | Marguerite Herman |
| Laramie Peak | Field Trips | |
| Laramie Peak, Oregon Trail landmark | Encyclopedia | WyoHistory.org |
| Laramie Plains Museum | Field Trips | |
| Laramie World War I Memorial | Field Trips | |
| Laramie, Wyo., history of | Encyclopedia | Kim Viner |
| Last Crossing, Sweetwater River | Encyclopedia | WyoHistory.org |
| Laurance S. Rockefeller Preserve Interpretive Center | Field Trips | |
| Leek, Stephen | Encyclopedia | John Clayton |
| Leeks Marina | Field Trips | |
| Legend Rock | Field Trips | |
| Legend Rock | Encyclopedia | WyomingHeritage.org |
| Legislature, Wyoming, Riot of 1913 | Encyclopedia | Gregory Nickerson |
| Leigh Lake | Field Trips | |
| Leigh, Richard “Beaver Dick,” mountain man | Encyclopedia | Steve Roberts |
| Leonard, Zenas camps on Laramie River 1831-32 | Encyclopedia | Hollis Marriott |
| Lightning Creek, fight at, 1903 | Encyclopedia | Lori Van Pelt |
| Lincoln County fair and rodeo | Field Trips | |
| Lincoln County, Wyoming | Encyclopedia | Jessica Clark |
| Lincoln Highway across Wyoming | Field Trips | |
| Lincoln Highway in Wyoming | Encyclopedia | John Clayton |
| Little Sandy Creek, Oregon Trail crossing of | Encyclopedia | WyoHistory.org |
| Little Snake River Museum | Field Trips | |
| Lockhart, Caroline - home of | Field Trips | |
| Lockhart, Caroline biography | Encyclopedia | John Clayton |
| Lombard Ferry | Field Trips | |
| Lombard Ferry on the Green River | Encyclopedia | Wyoming State Historic Preservation Office |
| Lost Cabin | Field Trips | |
