ABSTRACT The monograph deals with the current topic of circular economics and its implementation in business processes and strategies. It discusses this topic both on a general level and on the basis of several examples in the conditions of the Slovak Republic. The aim of the monograph is to clarify the principles of circular economics and relevant contexts. These related aspects are described as challenges for business and marketing in the form of opportunities or potential risks that may be associated with the transition of companies from a linear economy to a circular economy. The monograph contains 15 pictures and 8 tables. The knowledge base in writing the monograph consisted mainly of foreign literary sources. Keywords: circular economy, sustainability, circular business model, circular product, producer responsibility.