This document is for all psychologists, clinical and academic, who like almost everyone, have heard about mindfulness and want to know more. This is a read from a psychological perspective that is sympathetic to mindfulness but not eulogistic. We hope it will prompt people to think about where mindfulness could potentially offer support in their area of work. We hope that it will stimulate research in the many areas that the document highlights where there are promising exploratory and feasibility studies. In most areas there is still a need for better controlled trials, and yet at the same time, a huge richness in the qualitative and case study reports which may provide deeper insights into what actually happens when mindfulness is introduced into the therapeutic setting. This document is thus a guideline for practitioner psychologists. Experts in different specialties share their knowledge and views on the use of mindfulness-based approaches with some degree of scholastic rigour rather than just advocacy for mindfulness. Each highlights the evidence and is a reference for psychologists to orientate themselves to mindfulness in general and its application with their client groups. The guidance is a resource to ‘dip’ into and find out what clinicians are doing with different client groups. This document aims to increase the quality of service delivery and safety for clients, and point psychologists in some interesting new directions.