The presented thesis with a title "Non-competition clauses in M&A transactions from the perspective of Competition Law" aims to comprehensively analyse the question of conclusion of non-competition clauses with emphasis on the context of M&A transactions and the reasons for their conclusion. The main contribution of this thesis is to provide a comprehensive overview of the conditions of validity of non-competition clauses when these are observed, it is possible to consider the non-competition clause as agreed between the parties of the relevant M&A transaction as justified and proportionate, with a minimum risk of such clause being revoked. In the first chapter, I am dealing with the concept of M&A transactions, individual types of M&A tran...