| Bighorn Basin, Mormon colonizers in | Darcee Barnes |
| Bighorn Basin, Natural History of the | Emilene Ostlind |
| Bighorn Canyon National Recreation Area | |
| Bill Barlow’s Budget newspaper | Rebecca Hein |
| Bishop, Charles, forty-niner, death and grave of | Randy Brown |
| Bissonette family and 1868 wagon train attack | Rebecca Hein |
| Black 14 sites on the University of Wyoming campus | |
| Black 14, Hamilton, Mel, former University of Wyoming football player on his life and the | Phil White |
| Black 14, the | Phil White |
| Black Diamond Historic Mine Trail | |
| Black Hills National Forest | |
| Black Thunder Coal Mine | |
| Black, Dr. Willie, Chancellor of the Black Student Alliance in 1969, on the Black 14 | Wyoming State Archives |
| Blackwater firefighters memorial | |
| Blackwater forest fire, 1937 | Kerry Drake |
| Blizzard of 1949 | Rebecca Hein |
| Boarding Schools, Indian, in Wyoming and nationwide | Geoffrey O’Gara |
| Boissevain, Inez Milholland, suffragist and orator | Lesley Wischmann |
| Boysen Dam | |
| Boysen Dam, History of | Annette Hein |
| Bozeman Trail | |
| Bozeman Trail Museum | |
| Bozeman Trail sign and marker | |
| Bozeman Trail, brief history | Marilyn J. Drew |
| Brazil, Pedro II, emperor of | Phil Roberts |
| Bridger Trail | James A. Lowe, Wyoming State Historic Preservation Office |
| Bridger Trail through the Bridger Mountains | |
| Bridger Valley Historic Byway | |
| Bridger, Jim | James A. Lowe, Wyoming State Historic Preservation Office |
| Brinton Museum, The | |
| Brooks, Bryant | Wyoming State Archives |
| Brown's Park | |
| Brown, Melville C. | Kim Viner |
| Bucking-horse logo, Wyoming | Rebecca Hein |
| Buffalo Bill and the Pony Express | Tom Rea |
| Buffalo Bill Center of the West | |
