The results of the referendum on leaving the European Union by Great Britain have surprised experts from the world of politics, business analysts and immigrant community which functions in the British Isles. British people have decided, by a majority of votes, to shape the future of the UK outside the structures of the European Union. What does this choice mean for the community of Polish immigrants, which numbers almost one million people, working in the United Kingdom? Does Brexit and its consequences constitute a threat to Poles? The aim of this article is to analyse the economic, social and cultural effects of leaving the European Union by Great Britain, from the perspective of the Polish community in the British Isles.