This chapter provides detail description of cervical incompetence. Cervical incompetence (CI), epidemiology and aetiology of cervical incompetence, cervical conization and cone biopsy, obstetric trauma, dysfunctional cervical insufficiency, ultrasound evaluation, diagnosis, suture material, McDonald cerclage technique, Shirodhar’s operation, transcervical cerclage, Wurm technique, Lash operation, Trachelorraphy and medicolegal considerations are described in detail. 67 references are included at the end of the chapter to facilitate further reading.