The visa policy of the Schengen Area is set by the European Union and applies to the Schengen Area and to other EU member states without the opt-outs enjoyed by Ireland and the UK. If someone other than a European Union, European Economic Area (EEA) or Swiss citizen wishes to enter the Schengen Area, Bulgaria, Croatia, Cyprus or Romania they must have a visa or be a national of a visa-exempt country.

The Schengen Area consists of 22 European Union member states and four non-members who are members of EFTA: Iceland, Liechtenstein, Norway and Switzerland. Bulgaria, Croatia, Cyprus and Romania are not yet part of the Schengen Area but, nonetheless, have a visa policy that is based on the Schengen acquis.

Ireland and the United Kingdom opt out of the EU's visa policies and instead operate their own separate visa policies, as do certain overseas territories of EEA member states.

European Union citizens and European Free Trade Association (EFTA) nationals are not only visa-exempt but are legally entitled to enter and reside in each other's countries. Their right to freedom of movement in each other's countries can, however, be limited in a small number of situations.

The Schengen Area /ˈʃɛŋən/ is the area comprising 26 European countries that have abolished passport and any other type of border control at their common borders, also referred to as internal borders. It mostly functions as a single country for international travel purposes, with a common visa policy. The Area is named after the Schengen Agreement. Countries in the Schengen Area have eliminated border controls with the other Schengen members and strengthened border controls with non-Schengen states.

Twenty-two of the twenty-eight European Union (EU) member states participate in the Schengen Area. Of the six EU members that do not form part of the Schengen Area, four – Bulgaria, Croatia, Cyprus and Romania – are legally obliged and wish to join the area, while the other two – Ireland and the United Kingdom – maintain opt-outs. All four European Free Trade Association (EFTA) member states – Iceland, Liechtenstein, Norway and Switzerland – have signed agreements on association with the Schengen Agreement, even though they are outside the EU. In addition, three European microstates – Monaco, San Marino and the Vatican City – can be considered de facto participants.