The Thessaloniki Urban Transport Organisation ( el, Οργανισμός Αστικών Συγκοινωνιών Θεσσαλονίκης), abbreviated OASTH ( el, ΟΑΣΘ), is a
mass transport company
A company, abbreviated as co., is a Legal personality, legal entity representing an association of people, whether Natural person, natural, Legal person, legal or a mixture of both, with a specific objective. Company members share a common p ...
operating in
Thessaloniki,
Greece.
It was founded in 1957 and now covers a large area of the
metropolitan
Metropolitan may refer to:
* Metropolitan area, a region consisting of a densely populated urban core and its less-populated surrounding territories
* Metropolitan borough, a form of local government district in England
* Metropolitan county, a typ ...
area of
Thessaloniki, the country's second-largest city. OASTH only includes bus transportation due to lack of other means of transport.
History

Before the creation of OASTH in 1957, public transport in
Thessaloniki was initially covered by an extensive
tram network opened in the late 19th century. Later a
Belgian bus company started operating with horse-pulled carriages seating 4 to 5 people.
OASTH was founded by Presidential Decree 3721 and aimed at replacing the city's tram network as sole provider of public transport. The initial fleet included 283 buses of 60 to 80 seats.
In 1978, OASTH acquired the first
articulated bus
An articulated bus, also referred to as a banana bus, bendy bus, tandem bus, vestibule bus, wiggle wagon, stretch bus, or an accordion bus, (either a motor bus or trolleybus) is an articulated vehicle used in public transportation. It is usua ...
es in
Greece. In 1979 OASTH expands, taking over several routes previously operated by
KTEL in the suburbs of
Thessaloniki and also takes over the sea services operating by small boats during summer months and are replaced by new OASTH bus routes.
In 2003 OASTH expanded again and 12 new lines were created for the suburbs of
Thessaloniki. In 2009 64 new buses were added to the fleet, numbering 604 buses in total. The agreement with the
Greek state regarding the right to monopolise public transport in
Thessaloniki is valid until two years after the completio