The Institut Català de Nanociència i Nanotecnologia, with its official English translation Catalan Institute of Nanoscience and Nanotechnology and acronym ICN2, is a non-profit international research institute located close to Barcelona (Catalonia, Spain). It is devoted to generating knowledge, materials and devices in ICT, health, energy and the environment.

The ICN2's expertise lies at the nanoscale, where new properties, interactions, and ways to exploit them in everyday life are being discovered. Among its goals is to bring together scientists from diverse backgrounds in the pursuit of better science, better training, and better outreach to society while also seeking out new ways to engage with local and global industry.

ICN2 was accredited in 2014 as a Severo Ochoa Centre of Excellence, a recognition renewed in 2018 and 2023 for another 4-year period. The Severo Ochoa Programme, sponsored by the Spanish Ministry of Science, Innovation and Universities, aims to identify and support Spanish research centres that are among the world’s best in their specialty.

The trustees of the ICN2 are the Generalitat de Catalunya (Catalan Government), the Spanish National Research Council (CSIC) and the Autonomous University of Barcelona (UAB), where it is based. ICN2 is a CERCA Center and also one of the founding members of the Barcelona Institute of Science and Technology (BIST) and the Graphene Flagship.