Police are investigating the circumstances surrounding an incident which occurred in Mount Waverley this afternoon.
Emergency services were called to the intersection of Solomon Street and Huntingdale Road about 3.20pm after reports that an object had gone through a bus window and struck the driver in the head.
The driver, believed to be a man in his 60s, suffered non-life threatening injuries and was taken to hospital.
The area has been searched but at this stage no arrests have been made.
There were a number of passengers on the bus who left the scene before police arrival.
Investigators would like to speak to them or anyone else who may have information.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au