| Roripaugh, Robert, Wyoming Poet Laureate 1995-2002 | Encyclopedia | John D. Nesbitt |
| Rosa, Michael Angel | Encyclopedia | Paul Krza |
| Ross, Nellie | Encyclopedia | Wyoming State Archives |
| Ross, Nellie Tayloe and 1928 presidential campaign | Encyclopedia | Rebecca Hein |
| Ross, Nellie Tayloe, biographical essay | Encyclopedia | Tom Rea |
| Ross, William | Encyclopedia | Wyoming State Archives |
| Rural electrification, Wyoming history of | Encyclopedia | Kerry Drake |
| Russin, Robert, sculptor | Encyclopedia | Maria Wimmer |
| Ryan Hill, Oregon Trail site of | Encyclopedia | WyoHistory.org |
| Ryan, John “Posey,” early soldier, settler, murderer and hotelkeeper | Encyclopedia | Douglas R. Cubbison |
| Safety, Wyoming coal mines | Encyclopedia | Phil Roberts |
| Sagebrush Philosophy magazine | Encyclopedia | Rebecca Hein |
| Sailors, Kenny | Encyclopedia | Ryan Thorburn |
| Sailors, Kenny oral history | Oral Histories | Wyoming State Archives |
| Saleratus Lake, Oregon Trail site of | Encyclopedia | WyoHistory.org |
| Saleratus Lakes | Field Trips | |
| Salt Creek Museum | Field Trips | |
| Salt Creek Oil Field | Encyclopedia | Tom Rea |
| Salt Creek Oil Field | Field Trips | |
| Sarah Thomas grave | Encyclopedia | Randy Brown |
| Saratoga and Encampment Valley Railroad | Encyclopedia | Lori Van Pelt |
| Saratoga Museum | Field Trips | |
| Saratoga National Fish Hatchery | Field Trips | |
| 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 | |
