Molecular Communication (MC) is a highly interdisciplinary research field whose success requires the close collaboration between researchers from different fields of science. To support and highlight this interdisciplinary character, the Workshop on Molecular Communications (MolCom; https://molecularcommunications.org/) has been held annually since 2016 to provide the opportunity to meet, and share work and experience. The Workshop tries to promote research beyond the conventional disciplinary boundaries between engineering, the physical sciences, natural sciences, and medicine.