The following is a list of presently-operating bus transit systems in Finland with regular service. The list excludes charter buses and private bus operators, but includes demand-responsive transport systems.
| System | Locale | Central city or town | Website |
|---|---|---|---|
| HSL | Greater Helsinki | Helsinki | |
| Nysse | Tampere sub-region | Tampere | |
| Föli | Turku metropolitan area | Turku | |
| Oulun joukkoliikenne | Oulu sub-region | Oulu | |
| Koutsi | Kouvola sub-region | Kouvola | |
| Linkki | Jyväskylä sub-region | Jyväskylä | |
| Vilkku | Kuopio sub-region | Kuopio | |
| Ingå | Raseborg sub-region | Ingå | |
| Jakobstad | Jakobstad sub-region | Jakobstad | |
| Porvoo | Porvoo sub-region | Porvoo | |
| Riihimäki | Riihimäki sub-region | Riihimäki | |
| Uusikaupunki | Vakka-Suomi | Uusikaupunki | |
| Loimaa | Loimaa sub-region | Loimaa | |
| Hämeenlinna | Hämeenlinna sub-region | Hämeenlinna | |
| Sastamala | South Western Pirkanmaa | Sastamala | |
| Jämsä | Jämsä sub-region | Jämsä | |
| Kuusamo | Koillismaa | Kuusamo | |
| Iisalmi | Upper Savonia | Iisalmi | |
| Raahe | Raahe | ||
| Pieksämäki | Pieksämäki | ||
| Loviisa | Loviisa | ||
| Kotka | Kotka | ||
| Jouko | Lappeenranta | ||
| Imatra | Imatra | ||
| JOJO | Joensuu | ||
| Rovaniemi | Rovaniemi | ||
| Tornio | Tornio | ||
| Pori | Pori | ||
| Salon joukkoliikenne | Salo | ||
| Joukkis | South Savo, North Karelia, North Savo | Iisalmi, Joensuu, Mikkeli, Savonlinna, Kuopio, Varkaus | |
| Ålandstrafiken | Åland | Mariehamn | |
| Seutu+ | Turku sub-region | Turku | |
| Lohja | Lohja |