The European Union financial transaction tax is a proposal made by the European Commission to introduce a financial transaction tax (FTT) within some of the member states of the European Union (EU).

A financial transaction tax (FTT) is a levy on a specific type of financial transaction for a particular purpose. The tax has been most commonly associated with the financial sector for transactions involving intangible property rather than real property. It is not usually considered to include consumption taxes paid by consumers.