Background: The anal fissure is a small spilt in the distal anoderm, and it most commonly occurs in the posterior midline of anal canal. Anal fissure causes severe sharp pain on defecation, occasionally accompanied by streak of blood on outside of stool or blood on toilet tissue. Fissures are classified as acute or chronic, acute fissure usually heal spontaneously within six weeks. Fissurectomy had been used as separate technique in the treatment of chronic anal fissure with favorable result. Parallel inside sphincterotomy produces an enduring fall of anal resting pressure, that reestablish mucosal perfusion bringing about recuperating, yet genuine drive component is obscure, and the instrument that travel from intense to constant gap stay dark. This study is design to assess the outcome between two groups, than better modality of the two could be chosen. Objective: To compare fissurectomy and lateral internal sphincterotomy in the management of chronic anal fissure. Patient and Methods: The Randomized controlled trial was conducted during 18-02-2015 to 17-08-2015 at Department of surgery,Liaquat University of Medical & Health Sciences, Hyderabad. A total of 218 patients with chronic anal fissure were included in this study. Patients were randomly divided into two groups. Patients in Group A were underwent fissurectomy and patients group B was underwent lateral internal sphincterotomy. Surgery was performed and patients were followed for 8 weeks on regular basis and satisfactory out comes was noted. Information along with demographics was entered in the proforma. Results: Rate of satisfactory outcome was significantly high in group B as compare to group A [92.66% vs. 76.15%; p=0.001]. Conclusion: Subcutaneous sidelong internal sphincterotomy is a significant surgery for patients with persistent anal fissure. It is compelling and safe, offers fast help of torment, and advances early gap mending without being gone to by any significant complexities.