You only need a visa to enter Puerto Rico if you need a visa to enter the US, since the commonwealth follows the United States’ immigration laws. As a commonwealth, Puerto Rico subscribes to all the laws that apply to traveling and border crossing in the United States. US citizens can enter the commonwealth with proper proof of citizenship, such as a driver’s license with photo ID, a passport or a birth certificate. Visitors from other countries must have a valid, scannable passport. Countries participating in the Visa Waiver Program – the EU, Australia, New Zealand and much of Latin America – don’t need visas to get into Puerto Rico. The US State Department (www.state.gov) has current information about visas, immigration etc.