This page lists opinion polling for a United Ireland also known as a New Ireland.
In Northern Ireland
Notes
The Good Friday Agreement states that "the Secretary of State" should call a referendum "if at any time it appears likely to him that a majority of those voting would express a wish that Northern Ireland should cease to be part of the United Kingdom and form part of a united Ireland."
Non standard questions
Graph
This graph shows yes/no Irish re-unification poll results excluding non-standard questions such as those that may refer to additional factors. The phrasing of the question asked in the polls varies.
By religion and age and region
An opinion poll of 1,089 people conducted by LucidTalk in 2014 around the time of the Scottish referendum posed several questions. On the question of whether or not there should be a border poll, 47% said "yes", 37% "no" and 16% "don't know". On the question, "If a referendum on Irish Unity was called under the Good Friday Agreement would you vote: Yes for unity as soon as possible, Yes for unity in 20 years, or No for Northern Ireland to remain as it is", the results were as follows.
In 2016 an Ipsos MORI poll asked "If there was a referendum on the border tomorrow would you:" and the answers for different regions of Northern Ireland were as follows,
The same poll recorded answers from people in different age groups as follows,
Answers from people of different religious backgrounds were as follows,
Based on EU deals
A LucidTalk opinion poll of 1,334 Northern Irish residents conducted in Oct–Nov 2018 found majority support (60%) for Northern Ireland remaining in the United Kingdom if the UK were to remain an EU member state, an even split (48% each) if the UK were to leave the EU on the terms negotiated between the British Government and the EU, and majority support (55%) for Northern Ireland unifying with the Irish republic if the UK left the EU under a no-deal scenario.
In the Republic of Ireland
Multiple options
In October 2015 an opinion poll commissioned by RTÉ and the BBC and carried out by Behaviour & Attitudes asked those in the Republic of Ireland the question "There are a number of possible options for the constitutional status of Northern Ireland. In the short to medium term, do you think Northern Ireland should..." with the following responses,
Long term
When asked about tax
The poll then asked a further question concerning the influence of the tax consequences of a united Ireland on support for it,
In Great Britain
A 2019 poll by Ipsos Mori and King's College London asked people in Britain (England, Scotland, and Wales): "If there were to be a referendum in Northern Ireland on its future, would you personally prefer Northern Ireland to choose to stay in the UK or leave the UK and join the Republic of Ireland?" The responses revealed that 36% wanted Northern Ireland to stay in the UK, 19% wanted it to join the Republic, 36% had no preference, and 9% were undecided. It further revealed that support for Northern Ireland remaining in the UK was highest among those who intended to vote Conservative (49%) compared to 35% for Labour voters and 31% for Liberal Democrat voters.