This new volume “Iridium Catalysts for Organic Reactions� in the series “Topics in Organometallic Chemistry� intends to update several representative well-known reactions and to introduce other less known or new reactions in particular covering sustainability aspects. Iridium complexes are efficient in many catalytic homogeneous transformations providing high efficiency in both results, activity and selectivity.  The interest of the book lies in the presentation of the advances, new perspectives and application in a variety of representative iridium-catalysed reaction. All chapters in the volume are contributed by relevant international experts in the field. The book is aimed at researchers, graduate students and synthetic chemists at all levels in academia and industry.