SSHOC-NL is a collaboration between the social sciences and humanities that is cutting edge and unparalleled internationally. It will make it possible for researchers to securely and ethically link and analyse a huge range of data such as historical records, text data, images, survey data, and social media data. This will help them address some of the most pressing issues that society faces such as polarisation, social inequalities, and our changing environment. These issues are complex and require lots of different perspectives to be brought together in order to find solutions. SSHOC-NL builds the infrastructure for researchers to do that. This document is the grant proposal submitted to NWOLarge-Scale Research Infrastructure: National Roadmap consortia 2021.