Keolis Downer Northern Beaches[1] is a bus operator in Sydney, Australia.

A subsidiary of Keolis Downer, it operates services in Sydney Bus Region 8 on the Lower North Shore and Northern Beaches under contract to Transport for NSW.

[2] In October 2019, the Government of New South Wales announced that the bus operations of State Transit were to be contracted out to the private sector.

[4] Keolis Downer Northern Beaches (KDNB) commenced operating on 31 October 2021 with its contract to run for eight years.

[6] Keolis Downer Northern Beaches have inherited a fleet of 410 buses from the STA.