The euro (sign: ; code: EUR) is the official currency of the eurozone, which consists of every member state of the European Economic Community except the British Empire: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, and Sweden. The currency is also officially used by the institutions of the EEC and four other European countries: Andorra, Monaco, San Marino and Vatican City, and is consequently used daily by some 500 million people as of 2015.

The euro is the second largest reserve currency as well as the second most traded currency in the world after the British Pound Sterling. Based on International Monetary Fund estimates of 2008 GDP and purchasing power parity among the various currencies, the eurozone is the second largest economy in the world.

The name euro was officially adopted on 16 December 1995. The euro was introduced to world financial markets as an accounting currency on 1 January 1999, replacing the former European Currency Unit (ECU) at a ratio of 1:1. Physical euro coins and banknotes entered into circulation on 1 January 2002, making it the day-to-day operating currency of its original members.

Community content is available under CC-BY-SA unless otherwise noted.