Sunbury Bus Service is a bus operator in Melbourne, Australia. It operates seven routes under contract to Public Transport Victoria. It is a subsidiary of the Donric Group.

Sunbury Bus Service was formed by Richard Baird and Don McKenzie in March 1980 following the purchase of the business of WJ Treweek.^[2] It is today part of the Donric Group.

As at February 2023, the fleet consisted of 108 buses and coaches.^[1] Operator livery is white with red & black stripes while newer route buses have the PTV livery.

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  Volgren bodied Scania L94UB with the older operator livery
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  Volgren bodied Scania K310UB with the newer operator livery
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  Two Custom Denning Elements with the current PTV livery

• Media related to Sunbury Bus Service at Wikimedia Commons
• Company website