Directive (EU) 2021/555 is a legal act of the European Union which sets minimum standards regarding civilian firearms acquisition and possession that EU member states must implement into their national legal systems. It codified Council Directive 91/477/EEC of 18 June 1991. The member states are free to adopt more stringent rules, which leads to differences in the extent of citizens' legal access to firearms within different EU countries – see Gun laws in European Union countries.