| Province: | NS |
| Type: | Route |
| Route: | 305 |
| Length Km: | 27 |
| Length Round: | 0 |
| Length Ref: | [1] |
| Direction A: | South |
| Direction B: | North |
| Terminus A: | in Sydney River |
| Junction: | in Westmount in Leitches Creek Station |
| Terminus B: | in Little Bras d'Or |
| Counties: | Cape Breton Regional Municipality |
| Previous Type: | Route |
| Previous Route: | 304 |
| Next Type: | Route |
| Next Route: | 306 |
Route 305 is a collector road in the Canadian province of Nova Scotia.
It is located in the Cape Breton Regional Municipality and connects Little Bras d'Or at Highway 105 with Westmount at Trunk 4. It was originally known as Trunk 5 until 1970. In the 1960s between Point Edward and Sydney River this highway was also used for Nova Scotia Highway 125.