The organizers of the IXth edition of the Diffusion Fundamentals conference held in Kraków (Poland) from 21st to 24th September 2022 intend to continue the 16-years tradition of the series. Invitation to attend the conference is addressed to the wide milieu of scientists interested in diverse concepts of diffusion – understood not only as a movement of material bodies in all scales but also as any spreading phenomena in diverse areas of knowledge.