| Topic | Relevant Location | Description. |
| Baldness -- curing | Orange (Tit bits) | Use of telegraph battery cells to cure baldness. |
| Balls to notify time | Australia | Use of time balls. |
| Bamfield | Pacific Cable Station | See Pacific Cable |
| Belt & Buckle datestamps | Victoria | |
| Bicycles | For delivery of telegrams. | |
| Travelling from Perth to Melbourne. | ||
| Birds | Australia | See Cockatoos and Magpies. |
| Geese - Victoria | Knocking over a telegraph pole at Rokewood, Vic. | |
| Pigeons - Bourke, NSW | Flock flew into the telegraph wires. | |
| The Bird-Man of Yass, NSW | Mr. Colls - the Telegraph Station Master. | |
| Black Swan, WA. | Death of a Black Swan near Northam. | |
| Emus - Western Australia | Visitors to an isolated Telegraph Office. | |
| Birth notice | England | Implication of wiring family and friends by telegraph. |
| Birthdays | Australia | Ornamental birthday delivery forms. |
| Australia | Birthday Greetings from the Queen - 100 years young!!!! |
|
| Miscellaneous | Telegram depicted on humourous postcards. | |
| Boer War | N/A | Cutting the Telegraph lines (photograph from The Sphere). |
| South Australia | The celebrations at Nairne celebrating the end of the Boer War. |
|
| Borders | SA with NSW and Vic | Use of the telegraph by Todd to define Colonial borders. |
| NSW and Victoria | Triangulation to Cape Howe and Mt Kosciusko. | |
| Queensland and SA | Measurement of distances from Boulia. | |
| Botany | All over Oz. | See plants |
| British and Irish Telegraph Company | ||
| Broken Hill Company | New South Wales | Reference to the share float (July 1885). |
| Burke and Wills (Explorers) |
Victoria | See Explorers. |
| Bush fires | Australia | Urgent telegram warning of fire danger. |
| Bushrangers | The Kelly Gang | |
| Around Carcoar in Central West NSW | Ben Hall | |
| The need for a telegraph station at Jerilderie. | The area where the bushranger Morgan roamed. | |