Thessaloniki Urban Transport Organization

The Thessaloniki Urban Transport Organisation (Greek: Οργανισμός Αστικών Συγκοινωνιών Θεσσαλονίκης, romanized: Organismós Astikṓn Sygkoinōniṓn Thessaloníkīs), abbreviated OASTH (Greek: ΟΑΣΘ), is a mass transport company operating in Thessaloniki, Greece. It was founded in 1957 and now covers a large area of the metropolitan area of Thessaloniki, the country's second-largest city.