The Convention on a common transit procedure, also known as the Common Transit Convention, signed at Interlaken, Switzerland, on 20 May 1987, is an international agreement harmonising customs procedure in Europe. It was originally signed between the European Economic Community (EEC, as it was then; now the European Union) and the member states of the European Free Trade Association (EFTA) – Austria, Finland, Iceland, Norway, Sweden and Switzerland – and superceded ad hoc agreements between the EEC and Austria and Switzerland. Turkey, North Macedonia and Serbia have since joined the convention.^[1]

The United Kingdom is a party to the convention through its membership of the European Union. In the perspective of Brexit, it has also deposed instruments of accession on 30 January 2019, and shall continue to be a party in its own right when it leaves the EU.^[1][2]