Written by a diverse range of expert contributors, unified by a relational, ethics-based reading of person-centred theory and practice, this seminal text is the most in-depth and comprehensive guide to person-centred therapy. Divided into four parts, it examines the theoretical, philosophical and historical foundations of the person-centred approach; the fundamental principles of person-centred practice (as well as new developments in, and applications of, person-centred clinical work), explorations of how person-centred conceptualisations and practices can be applied to groups of clients who bring particular issues to therapy, such as bereavement or trauma, and professional issues for person-centred therapists such as ethics, supervision, and training. 10 years after it was last published, this third edition includes new content on the climate crisis, intersectionality and working with racism and anti-racism.It includes new dedicated chapters on the Non-directive Attitude, Relational Depth, Experiential Practices, Working with Trauma, Online PCA and Person-Centred approaches around the Globe. International and interdisciplinary in conception, this is a cutting-edge resource for students of psychotherapy and counselling on a range of programmes, as well as professional practitioners working in the field.