MedSilesia is a cluster of innovative companies within medical products in the Silesia region, managed by the Upper Silesian Agency for Entrepreneurship and Development Ltd (GAPR). MedSilesia concentrates on innovative technologies within rehabilitation, surgery and orthopaedic tools, diagnostic equipment, cardiology and other medical areas. Our mission is an efficient platform for collaboration between enterprises, research and development units; enhancing the combined potentials to implement innovative solutions, technology and knowledge transfer, exchange of experiences and implementation of joint projects. MedSilesia was nominated National Key Cluster. There are only 16 National Key Clusters in Poland, characterized by their significance to Polish economy and international competitiveness. Keywords: Medical industry, internationalization, joint projects.