Edirne (Turkish pronunciation: [eˈdiɾne]) is a city in Eastern Thrace, the northwestern part of Turkey, close to the borders with Greece and Bulgaria. Edirne served as the capital city of the Ottoman Empire from 1365 to 1453, before Constantinople (Istanbul) became the empire's new capital. At present, Edirne is the capital of the Edirne Province in Turkish Thrace. The city's estimated population in 2010 was 138,793, up from 119,298 in 2000. It has consulates of Bulgaria, Germany (Honorary), Greece, Romania (Honorary) and Slovakia (Honorary). Its sister cities are Haskovo and Yambol in Bulgaria and Alexandroupolis in Greece. There is a Jewish community.

The city was founded as Hadrianopolis (Aδριανούπολις), named for the Roman Emperor Hadrian. This name is still used in the Modern Greek (Αδριανούπολη). The English name Adrianople, by which the city was known until the Turkish Postal Service Law of 1930, has fallen into disuse. Turkish Edirne, Bulgarian Одрин (Odrin, [’odrin]), Albanian Edrêne, Macedonian Eдрене (Edrene) and Serbian Једрене (Jedrene) are adapted forms of the name Hadrianopolis or of its Turkish version. (see also its other names)