The main goal of this diploma thesis is to analyse the impacts of Brexit on British constitution. Brexit represents the process of The United Kingdom of Great Britain and Northern Ireland exiting the European Union. This very complex process has and will have significant impacts on the British constitutional system. Great Britain is very unique, because it does not dispose of codified constitution, therefore the examination of the impacts of Brexit on British constitution is a very interesting subject. The main objective of this diploma thesis is to bring an analysis of evident impacts of Brexit on the British constitution and to present the readers possible impacts, that might occur in the future.