Abstract. Sustainability is the contemporary meta-paradigm that influences both theory and practice of management. It reflect attitude of companies towards their environment, including natural resources, and enables obtaining competitive advantage if applied and implemented holistically and in a mature way. The goal of the paper is to present results of the assessment of organizational maturity in the aspect of sustainable resources management. The research was carried in Greatpoland (Wielkopolska) and Lower Silesia (Dolny Slask) regions in Poland between 2015 and 2016 to identify the level of maturity in the aspect of sustainable resources management.