Flow chemistry has been used in petrochemical and bulk chemical production for over 100 years but has only really been taken up in the pharmaceutical and fine chemical industries over the last 10 years or so. This course aims to give an introduction to the subject and an overview of the current state of the art. A variety of chemical reactions in flow and how to translate a conventional reaction in to a flow process will be described. This also entails choosing the right type of flow reactor for the chemistry, and a number of different flow reactor systems will be discussed and compared. Handling solids in flow systems, inline and online monitoring of flow reactions will also be covered along with the hazards and pitfalls associated with scaling up flow reactions.