Athens

=== Bus transport ===
OSY ({{lang-el|ΟΣΥ}}) (Odikes Sygkoinonies S.A.), a subsidiary company of OASA (Athens urban transport organisation), is the main operator of buses and trolleybuses in Athens. As of 2017, its network consists of around 322 bus lines, spanning the Athens Metropolitan Area, and making up a fleet of 2,375 buses and trolleybuses. Of those 2,375, 619 buses run on [[compressed natural gas]], making up the largest fleet of natural gas-powered buses in Europe, and 354 are electric-powered (trolleybuses). All of the 354 trolleybuses are equipped to run on diesel in case of [[Power outage|power failure]].<ref>{{Cite web |title=Στόλος λεωφορείων |url=https://www.osy.gr/ethelsite/pages/allBuses.php |url-status=live |archive-url=https://web.archive.org/web/20210417234252/https://www.osy.gr/ethelsite/pages/allBuses.php |archive-date=17 April 2021 |access-date=28 March 2021 |language=Greek}}</ref>

International links are provided by a number of private companies. National and regional bus links are provided by [[KTEL (Greece)|KTEL]] from two InterCity Bus Terminals; [[Athens Peloponnese Bus Station|Kifissos Bus Terminal]] A and [[Athens Liosion Bus Station|Liosion Bus Terminal]] B, both located in the north-western part of the city. ''Kifissos'' provides connections towards [[Peloponnese]], North Greece, West Greece and some [[Ionian Islands]], whereas ''Liosion'' is used for most of Central Greece. Both of these terminals will be replaced by a new Intercity Bus Terminal under construction in [[Elaionas|Eleonas]] due to be completed by 2026.