| Reshaw's Bridge | Field Trips | |
| Reshaw's Bridge | Encyclopedia | Jefferson Glass |
| Richards, DeForest | Encyclopedia | Wyoming State Archives |
| Richards, William | Encyclopedia | Wyoming State Archives |
| Riggle, Herschel Clay “Tricky” | Encyclopedia | Robin Everett |
| Ringo, Martin and J.P. Parker, Oregon Trail graves of | Encyclopedia | WyoHistory.org |
| Riverton Museum | Field Trips | |
| Robert Russin sculptures | Field Trips | |
| Roberts, LeaKae, Cokeville survivor oral history | Oral Histories | Wyoming State Archives |
| Roberts, Rev. John | Encyclopedia | Warren Murphy |
| Rock Avenue | Field Trips | |
| Rock Avenue, Oregon Trail site of | Encyclopedia | WyoHistory.org |
| Rock Church | Field Trips | |
| Rock Springs Historical Museum | Field Trips | |
| Rock Springs Main Street | Field Trips | |
| Rock Springs Massacre | Encyclopedia | Tom Rea |
| Rock Springs Walking Tour | Field Trips | |
| Rock Springs, African American churches of | Encyclopedia | Brie Blasi |
| Rock Springs, Wyoming | Encyclopedia | Chris Propst |
| Rocky Mountain Herbarium | Field Trips | |
| Rocky Mountain Oilfield Testing Center at Teapot Dome Oil Field | Encyclopedia | Carolynne Harris |
| Rocky Ridge | Encyclopedia | WyoHistory.org |
| Rocky Ridge | Field Trips | |
| Rogers, Clifford | Encyclopedia | Wyoming State Archives |
| Roncalio, Teno, biographical essay | Encyclopedia | Joan Barron |
| Roosevelt, Theodore 1903 Horseback Travel Route | Field Trips | |
| Roosevelt, Theodore visits Wyoming in 1903 Visit | Encyclopedia | Rebecca Hein |
| 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 | Field Trips | |
| Salt Creek Oil Field | Encyclopedia | Tom Rea |
| 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 | |
