The Fifteenth Autumn Meeting Patholinguistics with its main topic »Interdisciplinary treatment – multiprofessional cooperation in speech/language therapy« took place online on the 20th of November 2021. This annual meeting has been organised since 2007 by the Association for Patholinguistics (vpl), since 2021 by the German Federal Association for Academic Speech/Language Therapy and Logopaedics (dbs) in cooperation with the University of Potsdam. The present proceedings feature the keynote presentations on the main topic and information from the panel discussion as well as articles from the poster session covering a broad range of areas in research and practice of speech/language therapy.