Citybus Limited (Chinese: 城巴有限公司) is a bus company which provides both franchised and non-franchised service in Hong Kong. The franchised route network serves Hong Kong Island, cross-harbour routes (between Hong Kong Island and Kowloon/New Territories), North Lantau (Tung Chung and Hong Kong Disneyland), Hong Kong International Airport, Kowloon, New Territories, Shenzhen Bay Port and Hong Kong–Zhuhai–Macau Bridge Hong Kong Port. The non-franchised routes serve mainly City One Sha Tin. It also provides bus rental services and staff bus services for some large companies such as TVB and China Light and Power.
From 1984 to 2001 the company offered a cross-border service between Hong Kong and Mainland China using mainly Leyland Olympians, but this was discontinued due to stiff competition. However, in 2007, Citybus began operating route B3, which goes to Shenzhen Bay Port.
Since August 2020, the company is wholly owned by Bravo Transport which also owns the third largest operator, New World First Bus (NWFB). Prior to this, both NWFB and Citybus were owned by NWS Holdings and its predecessors. On 1 July 2023, the NWFB operations will be merged into Citybus.