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The European Union Customs Union (EUCU) is a customs union which consists of all the member states of the European Union (EU) and some of its neighbouring countries: Andorra, Monaco, San Marino and Turkey.

The customs union is a principal task of the European Economic Community, established in 1968, and now succeeded by the European Union. No customs are levied on goods travelling within the customs union andunlike a free trade areamembers of the customs union impose a common external tariff on all goods entering the union. One of the consequences of the customs union is that the European Union can negotiate as a single entity in international trade deals such as the World Trade Organisation, at the expense of individual member states' rights.

EU applicant Turkey and two bordering microstatesAndorra and San Marino are in customs union with the EU. Monaco, while not a member of the EU, is part of the EU customs territory through an agreement with France.

While all EU members are part of the customs union, not all of their respective territories form part of the customs union. This may be because a territory is not part of the EU, because the territories have opt-outs, or are excluded from the customs union because of their economic or geographic circumstances; see Special member state territories and the European Union.

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