Shipping sector is one of the major contributing factors to greenhouse gas emissions. As it is growing fast, shipping could produce 17% of global emissions by 2050 if it left unchecked. In this paper, we assess life cycle environmental impact of an aluminum patrol vessel of 25-meter size in Malaysia with the help of life cycle analysis (LCA) method. This paper also identifies the major hotspots of the life cycle impacts from the ship to examine the primary influential factors on environmental impact. Three main groups in the life cycle of the ship have been identified namely construction, operation, and disposal. In this analysis, this ship is considered to use the principle of cradle to grave that means this ship is built from raw materials and will be recycled after the ship is decommissioned. The results show that the operating part has given the highest value in climate change impact (GWP100) with 1.36048×10⁸ kg CO₂-Eq compared to the construction value in climate change impact (GWP100) with 1.70506×10⁶ kg CO₂-Eq.