Nowadays, most of developing country having serious problems facing shortage of post consumers disposal waste site. Due to this problem, it has been suggested to regenerating and using waste glass product as ways of replacing sand as construction materials and prevents the environmental pollutions. Therefore, this paper is conducted to investigate the properties of the mortar, which contain windscreen glass waste as an admixture. During the research, 60 specimens of mortar were prepared by using different proportions of windscreen glass waste, which are 10%, 20% and 30%. The entire specimen was designed with w/c ratio of 0.5 and partial replaced the sand with windscreen glass waste. This research focuses on the compressive strength of the mortar. The specimen was cast in cube mould with the dimension of 50mm x 50mm x 50mm. Then, the specimen was tested for 7, 14 and 28 days of curing. The result of compressive strength test for the specimens which contain windscreen glass waste partial replacement of sand has compared with the control sample. Based on the results obtained the windscreen glass waste in preparing the mortar improved the strength of the mortar with partial replacement of 30% of windscreen glass waste.