Book of abstracts for the GUWEM Workshop held at Linslerhof, Germany, from 8 July to 11 July 2024. In Europe, we have a small but vibrant community of researchers working on the theory and practical use of elastic waveguides for material characterization, nondestructive testing, structural health monitoring and sensors. This workshop aims to provide a platform where these groups with diverse interests can meet and exchange ideas. Current advances in the field will be presented in the form of talks and posters. The goal is not only to exchange but also to interconnect, creating opportunities for valuable collaborations. The event is organized by the „Institut Langevin“ and the „Bundesanstalt für Materialforschung und -prüfung (BAM)“. It is supported by the „Société Française d’Acoustique (SFA)“ and the „Deutsche Gesellschaft für Akustik e.V. (DEGA)“.