Do you need a passport to go from Dublin to Belfast? You don't need a passport to get from Dublin to Belfast. There is no Border Control between the North and Southern Ireland.

Under the long-standing Common Travel Area (CTA) agreement, there are generally no routine or permanent passport checks on the "Enterprise" train service between Belfast and Dublin. Because both Northern Ireland (UK) and the Republic of Ireland share an open land border, passengers can usually travel without showing ID upon boarding or alighting. However, in 2026, while the legal requirement for British and Irish citizens remains minimal, travelers should be aware that An Garda Síochána (Irish police) occasionally conduct "spot checks" on trains entering the Republic to verify immigration status, especially for non-CTA nationals. Furthermore, as of February 25, 2026, airlines like Aer Lingus have introduced mandatory passport rules for flights between the UK and Ireland, which has increased public confusion; however, these rules do not apply to the train. It is still highly recommended to carry a valid photo ID (like a driver's license or passport) in case of an identity check, and non-UK/Irish citizens must ensure they have the correct visa or ETA for the respective jurisdiction.