Yes, you can still travel to the Republic of Ireland using a valid National Identity Card issued by an EU or EEA member state. Unlike the United Kingdom, which ended the use of EU ID cards for most travelers following Brexit, Ireland remains a member of the European Union and the Schengen-adjacent Common Travel Area. This means that EU, EEA, and Swiss citizens can enter Ireland for tourism, work, or study using only their ID card, provided it is valid for the duration of the stay. However, if you are traveling from Ireland into Northern Ireland or the rest of the UK, the rules change significantly; the UK government now generally requires a full passport for entry from EU citizens, with limited exceptions for those with settled or pre-settled status. Therefore, while your ID card is sufficient for Dublin or Cork, you will need a passport if your itinerary involves crossing the border into Belfast or flying to London.