This is a list of the world's bus operating companies listed alphabetically by continent and country. This list includes companies both operating now and in the past.
- South Africa
- BAZ
- IKAPA
- Canada
- Alberta
- Calgary Transit
- British Columbia
- Coast Mountain
- Ontario
- Toronto Transit Commission
- OC Transpo
- Greyhound
- Voyageur
- Alberta
- Puerto Rico
- US
- Estonia
- Ekspressbuss
- MTG
- Taisto Liinid
- Tallinna Autobussikoondis (TAK)
- Finland
- Connex
- ExpressBus
- Helsingin kaupungin liikennelaitos (HKL)
- Länsilinjat
- Paunu
- Pohjolan Liikenne
- Savonlinja
- France
- Netherlands
- Connex
- BBA
- Connex SBM
- Eurolines
- Limex
- Connexxion
- Connex
- Sweden
- Linjebuss
- SweBus
- United Kingdom
- Metrobus
- Metrobus