P PT. Murano Glassindo Makmur is one of the glass processing factories in Indonesia. Glass products that are the focus of research are temepered glass products, because Tempered glass have the largest percentage of defects, therefore to minimize the number of defective products, quality improvement is carried out. The purpose of this study is to improve the quality of tempered glass products and also provide improvements that minimize the number of defective products. The approach used is six sigma by formulating Define, Measure, Analyze, Improve and Control (DMAIC). The define stage, identification is carried out with Critical to Quality (CTQ). At the measure stage, calculations are performed with the control chart p, control chart c, Defect per Million Opportunities (DPMO) and sigma level. The value of Defect per Million Opportunities (DPMO) was obtained before the improvement of 92200 and the sigma level of 2.827. The analyze stage, an analysis is performed using a Pareto diagram with defects in the form of wrong cuts, cracked and scratched, then analyzed using the Failure Mode and Effect Analysis method, the results obtained from the calculation of severity occurance, and detection with the highest RPN value of 252 in scratched failure and using the Fault Tree Analysis (FTA) method, the probability value obtained from the calculation of the basic event in the presence of other objects in the glass scrubbing process by 0.623, incorrectly laying of glass by 0.387 and inappropriate size by 0.586. The improve stage is given a proposed improvement in the form of edging inspection procedures, work instructions, and history cards. In the control stage after the proposed improvements are implemented, the DPMO value is 6550 and the sigma level is 3.009 sigm