Lothian Buses is to turn one of its vehicles blue next week in support of Prostate Scotland.
All staff will wear blue next Friday as part of efforts to raise money for the charity.
An inter-depot five-a-side football tournament will also be held.
The firm has pledged to match the money raised by staff dressing in the colour.
Lothian Buses managing director, Ian Craig, said: “In such a male-orientated company, this seemed an obvious choice of charity for us to support.”