I ndonesia is a country with high humidity, so Indonesia has a high intensity of lightning or thunderstorm days. High lightning intensity can cause buildings in Indonesia, especially tall buildings, to be vulnerable to being struck by lightning. This causes tall buildings to have a lightning protection system which aims to minimize the impact of being struck by lightning. Lightning protection systems are divided into two types, namely external lightning protection systems and internal lightning protection systems. This research was conducted at the Karya Building of the Ministry of Transportation of the Republic of Indonesia with the aim of determining the level of need for a lightning protection system, analyzing the lightning protection system contained in the Karya Building of the Ministry of Transportation of the Republic of Indonesia in accordance with PUIPP 1983 standards, SNII 03-7015-2004, and Ministerial Regulations Labor No: PER 02/MEN/1989 so that improvements can be made to safety and security standards. Based on research results, the radius of the lightning protection system at the Karya Building of the Ministry of Transportation of the Republic of Indonesia can protect the building as a whole. However, based on the method used, there are sides of the building that are not affected by the lightning protection. Apart from that, the condition of the corrosion effect on the down conductor is classified as good. Meanwhile, during grounding, the Ministry of Transportation\'s Karya Building has a resistance value of 0,5Ω. So it can be said that it is in accordance with the regulations and standards used.