Background: Glaucoma is a disease of progressive optic neuropathy with loss of retinal neurons and their axons (nerve fiber layer) result in a mist and patchy vision with eventual loss of central vision. In most cases glaucoma is associated with raised intraocular pressure and decreased visual acuity. Surgery is a definitive way of managing glaucoma. Trabeculectomy is a surgical procedure used to relieve intraocular pressure by removing part of trabecular meshwork and adjacent structures. Also helps to improve or stabilize visual acuity. Purpose: To determine surgical success of trabeculectomy at KCMC from January 2013 to December 2015. Methods: A cross sectional descriptive hospital based study using existing data was done at Kilimanjaro Christian Medical Center (KCMC). A total of 113 glaucoma patients who underwent trabeculectomy from January 2013- December 2015 at the eye department at KCMC was included. A data sheet guideline was used to collect information from the medical records as well as the patients’ hospital files. Data was cleaned with MS Access and analyzed using SPSS v 20.0. Results; This study enrolled 113 participants who met inclusion criteria. The mean age of this study was 59.16 with range of (16-89) years which accounts for 48.7%.. Majority of the participants were males 76/113(67.3%). In this study the mean preoperative IOP was 28.74 (+/- 11mmhg) with range (68-12mmhg) followed by postoperative mean IOP of 11.7mmhg (+/- 6.17mmhg) with range of (38-2mmhg). There was drop in IOP in 110/113 by (97.3%). However those who had drop in IOP to level less than 21mmhg were 95.45%. Enrolled cases in this study had preoperative visual acuity ranging from normalcy to blindness of the presenting eye according to the WHO category. Where 6/6-6/18 accounted 36% and 6/60-HM were 38% followed by 49.6% and 24.8% preoperatively and postoperatively respectively. Total of those who improved visual acuity after trabeculectomy were 73(64.6%). The success rate in this study was determined by both improve in VA and drop in IOP TO <21mmhg. The proportion of success rate was 57.5%. Conclusion; In Tanzania, where most of the population are in remote areas and poor economic status, trabeculectomy is cost effective in managing glaucoma thus late presentation of the disease. Trabeculectomy proved to be effective in lowering intraocular pressure hence preventing further damage to the eye and consequently preserving visual field and vision