This book derives from a course on chemical process design that I taught at the University of Cambridge, UK, between 2008 and 2018 and is intended to serve as a basic introduction to a number of disciplines within the topic. Given the immense breadth and depth of this subject, the aim of this book is to introduce and illustrate certain key points and concepts and to provide a template ‘workflow’ for certain procedures such as gaseous relief header design or distillation optimisation. Reference is made to specialist design manuals for specific topics such that more information can be obtained by the reader where necessary. The aim of this book is not to provide a definitive reference for all design scenarios but rather to act as an introductory guide! The book was originally written for undergraduate students embarking on their design project, but it is also intended to serve as a succinct reference guide to existing practitioners.