This book of Proceedings includes the contributions presented at the 13th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications - MAVEBA 2023, held in Firenze from 12 to 13 September, 2023. The previous edition of MAVEBA, held in December 2021 was celebrated in mixed mode just one year after the COVID-19 pandemic: a demonstration of strength and continuity despite the difficulties, which allowed us to meet once again from all over the World. The series of MAVEBA International Workshops started in 1999 and is continuously proposed every two years as a multidisciplinary meeting. It concerns the study of the human voice both from the methodological point of view and its biomedical applications. The aim is that of assessing reliable procedures for objective and quantitative definition of levels of voice disorders, singing voice parameters, newborn cry features, vocal fold and vocal tract modelling and mechanics. It welcomes contributions ranging from fundamental research and advanced technologies, with emphasis on translational research, the link with the "real" complex world of the human being. This 13th Workshop will offer again the participants an interdisciplinary platform for presenting and sharing knowledge and recent results in this multifaceted subject that involves bioengineers, otolaryngologists, phoniatricians, neurologists, logopaedicians, linguistics, singers, actors, and any specialist in related fields, with applications ranging from the newborn to the elderly.