Yes, Ibiza is part of the European Union. As one of the Balearic Islands, it is a province of Spain, which has been a member of the EU since 1986. Therefore, all EU laws and regulations apply to Ibiza.
Ibiza is well-known for its vibrant nightlife, beautiful beaches, and as a popular tourist destination. Being part of the EU means that residents and visitors from other EU countries can travel to and from Ibiza with minimal restrictions, benefiting from the freedom of movement within the member states.