This book is a selection of the best papers presented at the CUPUM conference at Aalto University, Helsinki, Finland in June 2021. CUPUM stands for Computational Urban Planning and Urban Management and is a once every two years conference, held somewhere in the world. This chapter is the introductory chapter to this book. It introduces the title and central theme of the book: ‘Urban Informatics and Future Cities’. Therein, three cross cutting themes can be identified: big data, disasters and resiliance, and walkability and tourism. Besides, the chapter provides an overview of the content of the volume by presenting briefly each of its consituting chapters, their titles and authors and their main content. In total 30 chapters have been included in this volume.