The eurozone crisis or also known as the European sovereign debt crisis could be considered as one of the longest lasting crisis in the history of Europe. What was triggered by the global financial meltdown in 2008, still leaves the eurozone in a deep mess. In an attempt to make sense of the crisis, this paper will analyse the eurozone crisis through Optimal Currency Area framework. Optimal Currency Area (OCA) is the concept introduced by Robert Alexander Mundell in 1961. It was this concept that sparked the creation of the eurozone as a single currency area. At its origins, the OCA was introduced as an attempt to resolve the international disequilibrium system caused by the fixed exchange rate system. He believed that by providing a criteria for an optimum currency area, such issues would be resolved. An optimal currency area, also known as an optimal currency region, is a geographic area in which economic efficiency would be maximized if the entire region shared a single currency. The optimal currency area offers a set of criteria by which a country's eligibility for membership in a monetary union can be assessed. The eurozone is the monetary union of 19 member states of the European Union that have introduced the euro as their main currency and the only legal tender. The monetary policy of all euro area countries is governed by the European Central Bank (ECB) and the Eurosystem, which consists of the ECB and the central banks of the EU countries that have joined the euro area. The European debt crisis, often called the eurozone crisis. The eurozone crisis was caused by the balance of payments crisis (a sudden halt in foreign capital in countries that had significant deficits and were dependent on foreign loans).