The Irish government will hold an emergency cabinet meeting
The UK has voted to leave the European Union in the historic referendum, official results show as the Out campaign passed the winning post with a lead of more than 1 million votes - a margin of 51.8% to 48.2%.
The pound plummeted to a 31 year low as the market responded to the prospect of the UK splitting from Brussels after 43 years.
The Irish government will hold an emergency cabinet meeting at Leinster House this morning and the Taoiseach Enda Kenny will address the media later.
UKIP’s Nigel Farage declared June 23rd will "go down in our history as our independence day" as projections suggested the UK had voted to leave the EU.
Sinn Fein has said Brexit should lead to a poll on Irish unity, after Northern Ireland voted by 56% to 44% to Remain.
The outcome plunges into doubt the future of the Prime Minister David Cameron, who called the referendum, with some of his own backbenchers openly raising the possibility of a general election.
It follows a brutal, deeply-divisive campaign, which saw bitter "blue-on-blue" attacks within the Conservative Party.
Labour has already said he should "seriously consider his position" if Leave won, while Mr Farage said he should quit "immediately".
The result has also seen Scotland's First Minister Nicola Sturgeon pave the way for a second independence referendum.
She argued the EU vote "makes clear that the people of Scotland see their future as part of the European Union" after all 32 local authority areas north of the border returned majorities for Remain.
The EU vote exposed splits across the UK, with Leave performing strongly in the English rural areas, Wales and north eastern towns and cities like Sunderland, Middlesbrough and Hartlepool.
At the same time, Remain secured decisive majorities in London, Scotland and Northern Ireland.