| Stepp, Alonzo, black rancher in the Green River Valley | WyoHistory.org, Jonita Sommers |
| Stewart, Elinore Pruitt, Writer and Homesteader | Barbara Allen Bogart |
| Strausner, Adam LeRoy, oral history | Dana Van Burgh |
| Sullivan, Mike | Wyoming State Archives |
| Sullivan, Mike, U.S. ambassador to Ireland, oral history | Tom Rea |
| Swain, Louisa, first woman to vote under Wyoming Territory’s new woman suffrage law | Wyoming State Archives |
| Tarquinio, Enzo | Laura E. Ruberto |
| Terry, George, murder of | Dick Blust, Jr. |
| Thaxton, Edith, on Dances in the Bighorn Basin | Washakie Museum and Cultural Center |
| Thayer, John | Wyoming State Archives |
