Citybus or City bus may refer to:
- A city bus, also known as a commuter bus, transit bus, or public bus
- Citybus (Hong Kong), a bus operator in the territory of Hong Kong.
- Metro (Belfast), a bus operator in the city of Belfast, Northern Ireland, with an older name of Citybus.
- The Greater Lafayette Public Transportation Corporation, which uses the operating name of CityBus.
- Volvo Citybus (also known as B10MD, D10M), a double-deck bus developed from mid-engined Volvo B10M.
- Plymouth Citybus, a bus operator in the city of Plymouth.
- Capital Citybus, a former London bus operator by Citybus Hong Kong and have been purchased by First Group.
- Irisbus Citybus, a model of urban bus built by Irisbus. Available in 12 metre and 18 metre versions.
- Indore City Bus, a road transport system run by Indore City Transport Services Limited in India
The similar name Citibus may refer to:
- Citibus (New Zealand), a bus and coach company in New Zealand
- Davenport CitiBus, public transit in Davenport, Iowa
- Citibus (Lubbock), a public transit service in Lubbock, Texas
- Citibus Tours, a bus company that operated in Greater Manchester, England