Metacognitive therapy (MCT) is a recent development in the treatment of emotional and other psychological disorders. It is based on a comprehensive information-processing model of self-regulation that has gained considerable support. Independent analyses of MCT suggest that it is associated with high recovery rates and can be more effective than cognitive–behaviour therapy. This paper introduces a special issue of metacognitive theory, therapy and techniques. This special issue aims to showcase recent key developments in the empirical evaluation of metacognitive theory and therapy across several specific disorders and stimulate future research in this area. Collectively, the papers contribute to the body of research supporting this innovative approach.