Colloquia on Complex Systems represent a special series of seminars by eminent speakers who are working at the forefront of complex systems and are inspiring the evolution of the field. Introduced in 2016, this series of Colloquia allows students and scientists of IFISC and the UIB to interact with leaders in Complex Systems science in the intimate environment of our Institute and to discuss the challenges and future directions of this cross-disciplinary research field. Colloquia on Complex Systems will be webcast and are globally available.