Belfast Airport Passports You need a valid passport to enter the Republic or Northern Ireland. Air and sea carriers require some form of photo identification (usually either a passport or driving licence), so ALWAYS check what form of ID is required with your individual airline, ferry company or travel agent before travelling. While e-passports are commonly used now, you don't need one to enter Ireland. Recommended reading Travel Essentials Use our travel essentials checklist: everything you need to know from pets to public holidays, languages and more. Customs and Borders Before you get on that plane, take a look at the customs and borders procedures you can expect when you step off. Travelling in Ireland Whether it's by air, road or sea, we've got the lowdown you'll need on any mode of travel around the island.