If you are a citizen of the European Union and the European Economic Area, you won't need a visa to enter the country. A valid passport or national identity card is required.
Should you bring cash to Ibiza?
The official currency in Ibiza is the Euro (EUR). Order your travel money before you go and make your cash stretch further. There's also the option to exchange when you get there but rates are often higher, particularly at the airport. The Euro is the only form of Ibiza money that's accepted as legal tender.