The International Conference on Sewer Processes and Networks (SPN) is held every 3rd year by the Sewer Systems and Processes Working Group under the IWA specialist group on Urban Drainage (Joint IAHR/IWA). The last of these conferences, the SPN 8, SPN 9 and SPN 10, were held at TU Delft in Rotterdam, The Netherlands, at Aalborg University in Aalborg, Denmark, and at TU Graz in Austria. The next SPN will be held from 20th to 22nd of May 2025, and we are happy to host the 11th edition of the International Conference on Sewer Processes and Networks in Trondheim, Norway at the Norwegian University of Science and Technology (NTNU).