Determination of Parenthood (Abstract) The topic determination of parenthood today is very actual nowadays and it is not possible to neglect its importance. Changes taking place both in the social life of modern times, and in the field of medicine is necessary to constantly reflect and to adapt them to the legal order. Concepts such as assisted reproduction, surrogacy, concealed birth and baby-boxes are a common part of human society and it is not possible to avoid dealing with the situation around them. The aim of this thesis is to summarize the Czech legislation of determination of parenthood, to mention problematic situations that may arise in connection with it and describe possible solutions to these situations. The another aim then is to acquaint the reader with the newly developing institutions, such as assisted reproduction, surrogacy, concealed birth, baby boxes, etc., and analysis of their current legal status supplemented by comparison of legislation in other European and non-European countries, which could serve as inspiration for future development in the Czech legal order. The first chapter deals with family law, family and relationships between parents and children both from a theoretical and historical point of view. The second chapter is devoted to an overview of the most important changes...