The paper assumes that strategic partnering, as one of the more mature forms of inter-organisational cooperation, is also an effective method of support for strategic activities of enterprises. In the light of the above, the use of strategic partnering in processes aimed at enhancing their competitiveness was proposed. The aim of the analyses is to identify and systematise the key actions in the mechanism of building competitiveness through strategic partnering of enterprises. For its implementation, a review of literature in the field of theory of organisation, theory of cooperation and partnering as well as theory of competitiveness was carried out. Empirical research to verify the initial theoretical assumptions was also conducted. Quantitative research (surveys) and qualitative research (extended case studies) was carried out. The study was based on the research procedure modelled on forecasting methods of searching for solutions to organisational problems, i.e. on creative (lateral) thinking. As a result, the algorithm of building competitiveness through mature strategic partnering was formulated and recommendations were made as to the possibility of its practical use.