Greenhouse gas(GHG) emissions are a major cause of global warming and climate change, and are currently emerging as serious environmental problems worldwide. Among them, glass bottles do not decompose naturally, and a lot of resources and energy are input into the production and processing processes, so recycling of glass bottles is important in terms of resource conservation, minimizing environmental pollution, and reducing GHG. Therefore, this study created a material flow diagram of glass bottles using related statistical data such as domestic glass bottle production and processing volume. In addition, the US EPA WARM model, Prognos calculation method, and Christensen's calculation method were used to estimate the greenhouse gas reduction amount of glass bottles. As a result of the study, out of about 490,000 tons of waste glass bottles discharged as municipal waste, about 300,000 tons (61.2%) were recycled, and the rest were incinerated (22.1%) and landfilled (17.3%). As of 2022, it is estimated that approximately 73,399 tons CO2eq/yr will be reduced when applying the US EPA WARM model, approximately 52,847 tons CO2eq/yr when applying the Prgonos calculation method, and approximately 135,201 tons CO2eq/yr when applying the Christensen's calculation method. Further research is warranted that the methodology and GHG saving emission factors by reflecting glass recycling conditions and processes in Korea should be developed to reduce uncertainty of the results.