PT A is a cement industry that produces slag, portland cement, and composite portland cement. This research aims to examine the environmental impacts of the cement industry by applying the Life Cycle Assessment method. The methods used in this research are divided into goal and scope, life cycle inventory, life cycle impact assessment, and interpretation. This research uses SimaPro software for data processing. In carrying out impact assessments using Life Cycle Assessment, several methods are used such as CML IA Baseline V3.05, Impact 2002+, EPD 2018, and Cumulative Energy Demand. The results show that there are two types of impacts. Primary impacts include global warming, eutrophication, acidification, and stratospheric thinning. Meanwhile, secondary impacts are photochemical oxidation, abiotic depletion of fossils and non-fossils, terrestrial and aquatic ecotoxicity, carcinogenicity, toxicity, water consumption, land use change, and non-renewable energy depletion.