This special issue on Competition law developments in Central and Eastern Europe contains 93 notes and articles from Central and Eastern Europe (CEE) with keyword competition policy, i.e. cases where countries’ competition policy was notably changed, reformed or implemented. It aims to cover the following thirteen countries: Bulgaria, Croatia, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Montenegro, Poland, Romania, Serbia, Slovakia, and Slovenia. This special issue mainly concerns competition policy developments by competition authorities and the legislature. Although the selection of notes and articles collected for the purposes of this special issue is by all means not exhaustive, it is fascinating to observe how vibrant the competition policy-related activities by different CEE competition authorities are and how various national jurisdictions have diverse focuses. In the following sections, we outline the most significant trends and developments.