What is the name of the treaty that established the European Economic Community in 1957?

The Treaty of Rome established the European Economic Community in 1957.

More precisely, the document was formally called the Treaty establishing the European Economic Community. It was signed in Rome on 25 March 1957 by Belgium, France, Italy, Luxembourg, the Netherlands, and West Germany, and entered into force on 1 January 1958.

The treaty aimed to create a common market by progressively removing customs duties and supporting the free movement of goods, workers, services, and capital. It also provided foundations for shared policies in areas such as agriculture and transport, helping turn postwar cooperation into deeper economic integration.

The main confusion is with other European treaties. The 1951 Treaty of Paris created the European Coal and Steel Community, while the Maastricht Treaty established the modern European Union framework. The Lisbon Treaty later renamed and amended the Rome treaty's successor text, now known as the Treaty on the Functioning of the European Union.