You do not need a visa for Ireland
Ireland and the United Kingdom share a Common Travel Area. This means British citizens can travel to Ireland for any reason and stay for any length of time.
Note: The decision by the UK to exit the European Union does not affect travel for British citizens to Ireland at this time.
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When you travel
Travel directly to Ireland from UK, Isle of Man or Channel Islands
British citizens do not need a passport to enter Ireland when travelling direct from the UK, Isle of Man or Channel Islands (within the Common Travel Area). This includes the land border with Northern Ireland.
However, if you arrive by air or sea you may be asked for proof of citizenship at border control. Your carrier may also ask you for an identity document.
In this case, you are advised to bring your passport.
Travel from outside the UK to Ireland
If you travel to Ireland from a location outside the UK (outside the Common Travel Area), you must always have your passport with you.
If you cannot satisfy the immigration officer at border control, you will not be allowed into the country.
There are extra rules if you are travelling with children under 18.
Other types of British citizen or national
Your freedom to travel to or stay in Ireland is more restricted if you are a British overseas territories citizen, British overseas citizen, British national (overseas) or other type of British citizen or national.
During your stay
Bringing your family to Ireland
Your family and children can come with you to Ireland.
If a member of your family is a non-EU/EEA or non-Swiss citizen, there are extra rules.