Three neutron science research reactors in Europe have ceased operations in 2019. The League of advanced European Neutron Sources, LENS, and the European Neutron Scattering Association, ENSA, warn of a “neutron gap” that could impact scientific research across multiple fields in physics, materials science, chemistry, biology, medical science and engineering. Together, LENS and ENSA are working on a new vision to maintain Europe’s leading position in neutron science.