Thessaloniki Transport Authority

{{Infobox organization

|name = Thessaloniki Transport Authority

|logo = Thessaloniki Transport Authority logo.svg

|logo_size = 130px

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|abbreviation = ΟΣΕΘ (OSETH)
TheTA

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|formation = 25 July 2017{{Cite journal|date=25 July 2017|title=ΝΟΜΟΣ ΥΠ’ ΑΡΙΘΜ. 4482 {{endash}} Νέο ρυθμιστικό πλαίσιο για τις αστικές συγκοινωνίες στην Περιφερειακή Ενότητα της Θεσσαλονίκης και άλλες διατάξεις|trans-title=Law No. 4482 {{endash}} New regulatory framework for the urban transport of the Thessaloniki Regional Unit and other provisions|url=http://www.et.gr/idocs-nph/search/pdfViewerForm.html?args=5C7QrtC22wEsrjP0JAlxBXdtvSoClrL8sN_CI5tJ5zV5MXD0LzQTLWPU9yLzB8V68knBzLCmTXKaO6fpVZ6Lx9hLslJUqeiQRDlbAQs2CJabvpAXWA5KnUiLj6JO3H_9xtidam7Fpqw.|journal=Government Gazette of the Hellenic Republic|language=el|location=Athens|publisher=National Printing House|volume=1|issue=102}}

|extinction =

|type = Anonymi Etaireia

|status =

|purpose = Transport authority

|headquarters =

|region_served = Thessaloniki

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|website = {{url|oseth.com.gr}}

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}}

The Thessaloniki Transport Authority ({{langx|el|Οργανισμός Συγκοινωνιακού Έργου Θεσσαλονίκης}}, 'Thessaloniki Transport Project Organisation', abbreviated as ΟΣΕΘ), is an anonymous company which plans, coordinates, and oversees the urban transportation network of Thessaloniki,{{Cite web |url=http://oseth.com.gr/%CE%BE%CE%B5%CE%BA%CE%B9%CE%BD%CE%AC-%CE%B7-%CE%B5%CF%80%CF%8C%CE%BC%CE%B5%CE%BD%CE%B7-%CE%BC%CE%AD%CF%81%CE%B1-%CE%B3%CE%B9%CE%B1-%CF%84%CE%B9%CF%82-%CF%83%CF%85%CE%B3%CE%BA%CE%BF%CE%B9%CE%BD%CF%89/ |title=Ξεκινά η επόμενη μέρα για τις συγκοινωνίες στη Θεσσαλονίκη |date=14 January 2019 |website=www.oseth.com.gr |language=el |trans-title=The new day in Thessaloniki's urban transport is dawning}} the second largest city in Greece. It is abbreviated as TheTA in English, a wordplay on the letter Theta which the first letter the word "Thessaloniki" in Greek. Its creation was necessitated in anticipation of the completion of the Thessaloniki Metro in 2023, which will see the city's bus network redeveloped, and the TheTA will take over the role of the Thessaloniki Urban Transport Organization once the metro is opened.