<p>Taking the long-established evidence on knowledge spillovers that states that part of the new created knowledge spills over to other firms mostly located in the physical proximity, we aim at providing evidence on the role of green knowledge spillovers on firms’ innovation. We posit that in addition to internal factors, firm innovation is determined by external regional factors, among which we specifically focus on the spillovers generated by environmental EU-funded research at the regional level. The results indicate that the presence of partners engaged in EU-environmental projects in a region has a positive and significant effect on process innovation.</p>