Competition discipline in the European Union is a substantial component of the EU’s institutional framework. The Lisbon Treaty made the “internal market” a shared competence, while necessary competition rules for the internal market are an exclusive competence of the Union. This paper aims to analyse the sources of the competition discipline in the EU and in Albania focusing more on constitutional sources. From this analyses will emerge that sources of competition discipline are numerous and each of them plays an important role in the development of the competition policy. But arises the question if these sources are all equally important or not? This paper will focus also n the importance of each source in both levels: European Union and Albanian discipline of competition.