The article concerns the issue of unfair competition in the Polish law. It covers the evolution of the regulation of unfair competition in Poland from 1st World War to present day. The analysis concerns the Polish national prescriptions as well as the EU law. In the part concerning the Polish national prescriptions the article covers not only the analysis of the act of combating the unfair competition and the act of unfair business-to-consumer commercial practices but also the Polish Constitution, intellectual property law, the act of protection of databases as well as the act of protection of competition and consumers. In the part concerning the EU law the analysis concerns the primary and the secondary EU law. The aim of this article is to show the actual state of the Polish law of unfair competition.