Subject and Keywords:
Principles of laws is an essential constituent of every branch of law. Sources of principles of law are the Constitution of the Republic of Poland and special law acts like codex (civil code, administrative procedure code etc.). Thus, public economic law is considered as a separate branch of Polish law. The basic law act for public economic law is the Business Law Act from the 6th March 2018. The aim of this paper is to present the principles of public economic law from the Business Law Act.