Photonics and nanotechnologies are highly multi-disciplinary fields and two of the principal enabling technologies for the 21st century. They are key technology drivers for industry sectors such as information technologies, communication, biotechnologies, transport, and manufacturing. Photonics/nanophotonics and nanomaterials/nanotechnologies can benefit from each other in terms of new functions, materials, fabrication processes and applications. The MONA Roadmap identifies potential synergies between photonics/nanophotonics and nanomaterials/nanotechnologies. The challenge of mastering nanoelectronics and nanophotonics science and technologies at an industrial scale is of utmost strategic importance for the competitiveness of the European industry in a global context.