Abstract
The withdrawal of Great Britain from the European Union turned out to be important not only for the citizens of this country but for all Member States of the European Union. One of the important consequences of notification of withdrawal from the organization was to determine the constitution of the European Parliament taking into account various variants of the moment when Brexit takes effect. The purpose of this article is to analyze the impact of the UK's withdrawal from the European Union on the conduct of elections and the appointment of seats in the European Parliament. This issue was presented primarily on the example of the elections held in Poland. The first part of the article discusses the procedure for the withdrawal of Great Britain from the EU and related problems. The second part is devoted to the impact of Brexit on the distribution of seats in the EP depending on the moment of Great Britain's withdrawal from the European Union. The third part of the article examines the problems associated with the procedure for indicating a Polish representative awaiting his mandate and his status.