| Saratoga Sun | Field Trips | |
| Saratoga, Wyoming, history of | Encyclopedia | Lori Van Pelt |
| Saratoga-Platte Valley Chamber of Commerce | Field Trips | |
| Schneider, Adam, Featherweight Boxer | Oral Histories | Washakie Museum and Cultural Center |
| Second Baptist Church, Rock Springs | Encyclopedia | Brie Blasi |
| Sellett, Mike, Jackson Hole News publisher | Encyclopedia | Kerry Drake |
| Seminoe Cutoff | Encyclopedia | Randy Brown |
| Seminoe Cutoff | Field Trips | |
| Seminoe Dam | Field Trips | |
| Seminoe Dam, History of | Encyclopedia | Annette Hein |
| Seminoe State Park | Field Trips | |
| Sheep Business in Wyoming | Encyclopedia | Samuel Western |
| Sheep Creek Cemetery | Field Trips | |
| Sheepeaters | Encyclopedia | Rebecca Hein |
| Shepard, Matthew, Legacy of | Encyclopedia | Jason Marsden |
| Shepard, Matthew, Murder of | Encyclopedia | Jason Marsden |
| Shepperson, Frank, oral history | Oral Histories | Mark Junge |
| Sheridan County Coal Camps | Encyclopedia | Kevin Knapp |
| Sheridan County Museum | Field Trips | |
| Sheridan County, Wyoming | Encyclopedia | Brodie Farquhar |
| Sheridan Inn | Field Trips | |
| Sheridan, Wyoming | Encyclopedia | Gregory Nickerson |
| Shoshone Cavern National Monument | Encyclopedia | Phil Roberts |
| Shoshone Irrigation District | Field Trips | |
| Shoshone Reservation, 1905 Land Cession Agreement | Encyclopedia | WyoHistory.org |
| Siberia, 2nd Lt. Paul Kendall’s service in, 1919-1920 | Encyclopedia | Douglas R. Cubbison |
| Sidon Canal Historic Marker/Prayer Rock | Field Trips | |
| Simpson, Milward | Encyclopedia | Wyoming State Archives |
| Simpson, Milward - interview | Oral Histories | Wyoming State Archives |
| Simpson, Milward and the death penalty | Encyclopedia | Robin Everett |
| Simpson’s Hollow | Field Trips | |
| Simpson’s Hollow | Encyclopedia | WyoHistory.org |
| Site of the Wagon Box Fight | Field Trips | |
| Sixth Crossing of the Sweetwater, Oregon Trail historic site | Encyclopedia | WyoHistory.org |
| Smith, Alfred E. | Encyclopedia | Rebecca Hein |
| Smith, Nels | Encyclopedia | Wyoming State Archives |
| Snodderly, Quintina, Oregon Trail Grave of | Encyclopedia | WyoHistory.org |
| Snow King ski area | Field Trips | |
| Snowy Range Scenic Byway | Field Trips | |
| Solier, C.H., Wyoming State Hospital superintendent | Encyclopedia | Rebecca Hein |
| Sommers Ranch | Encyclopedia | Stephanie Lowe |
| South Pass | Encyclopedia | Will Bagley |
| South Pass and its monuments | Field Trips | |
| South Pass City | Encyclopedia | WyomingHeritage.org, Wyoming State Historic Preservation Office |
| South Pass City | Field Trips | |
| South Pass Gold Rush | Encyclopedia | Will Bagley |
| South Pass Overlook | Field Trips | |
| South Pass, discovery | Encyclopedia | Will Bagley |
| South Pass, early missionaries | Encyclopedia | Will Bagley |
| South Pass, First Wagons | Encyclopedia | Will Bagley |
