This chapter provides detail description of Instrumentation and distension media in diagnostic and surgical hysteroscopy. Chapter has 14 well illustrated diagrams and pictures. Hysteroscopes, flexible hysteroscope, monopolar resectoscope, light sources, recording images, auxillary material, hysterometer, tenaculum, surgical hysteroscope, distension media, high viscosity fluids, low viscosity fluids, distension systems, diagnostic hysteroscopy are described in detail. 1 table is included to highlight classification of endoscopes. 20 references are included at the end of the chapter to facilitate further reading.