The purpose of this thesis is to present the impact of Brexit on the North Irish question. In addition, I would also like to present the historical context of the North Irish question, analyse the demographics of Northern Ireland and analyse the consequences of UK's exit from the EU on Northern Ireland, with a focus on a no-deal Brexit. The work for this thesis was exclusively cabinet work. It included reading literature and analysing data. Brexit has had a significant impact on the North Irish question since it has reignited debate on it. Changes in the demographics of Northern Ireland, especially the possible dominance of Catholics in the coming years, will be key to the future of the North Irish question. The census that will take place in 2021 will tell us the exact change. No-deal Brexit would cause economic damages to the UK, which would be even more severe in Northern Ireland. Together with economic damages caused by COVID-19 this increase the possibility of a United Ireland.