Topics in Modal Analysis, Testing & Parameter Identification, Volume 9: Proceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics, 2023, the ninth volume of ten from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Modal Analysis, Modal Testing and Modal Parameter Identification including papers on:Analytical MethodsModal ApplicationsBasics of Modal AnalysisExperimental TechniquesOperational Modal AnalysisModal Parameter IdentificationNovel TechniquesRotating MachineryAdditive Manufacturing ApplicationsBiomedical Applications