Organometallic chemistry that combines organic and non-organic, is an important field in chemistry that was especially developed in the last 10 years. This field greatly contributes to catalytic processes in the plastics industry and the production of medical and agricultural materials. Several Nobel prizes have been awarded to scientists dealing with this subject in the last few years. The book is organized by the periodic table. The subjects introduced in the chapters of this book are: organometallic compounds, Transition elements (arranged according to the ligands attached to them ), Catalysts and catalytic systems in polymerization or synthesis in coupling, metathesis or cyclization reactions. This book is intended for university and college students taking a course in the organometallic compound field.