Diamond North West
| Parent | Rotala |
|---|---|
| Founded | April 1998 (as Green Triangle Buses) |
| Headquarters | Eccles |
| Service area | Greater Manchester Lancashire |
| Service type | Bus services |
| Routes | 56 |
| Hubs | Ashton, Oldham, Manchester, Bolton, Wigan, Salford, Stockport |
| Depots | 2 |
| Website | Official website |
Diamond Bus (North West) Ltd., trading as Diamond North West, is a bus operator providing services in the districts of Bolton and Wigan in Greater Manchester, England, operating an extensive commercial network as well as franchised Bee Network bus services on contract to Transport for Greater Manchester. It also serves some areas of the districts of Salford and Trafford.
The company was founded as Green Triangle Buses and then subsequently renamed South Lancs Travel before being purchased by Rotala and rebranded as Diamond North West in 2015. In August 2019, Diamond North West purchased First Manchester's Bolton garage, which was later transferred with its vehicles to Go North West under Tranche 1 of the Bee Network.