This study aims to analyze the determination of the legal status of people conducting human colonization on Mars and the protection of international law against them. This type of research is descriptive normative research in order to describe the principles of International Law used in determining the legal status of people conducting human colonization on Mars and protecting International Law against them. The data source used is secondary data, data collection techniques study documents or library materials used to be able to find secondary data. The results of this legal research are: first, people who do human colonization on Mars conducted by SpaceX can be considered as astronauts or personnel as a term given by international treaties. This is based on the provisions of Article 10 of the Moon Agreement. Second, people who conduct human colonization are considered as astronauts and personnel so that they get the same legal protection as astronauts and personnel in space exploration in general. The use of the Moon Agreement as a basis for determining the legal status of those colonizing the planet Mars certainly cannot be longlasting. Because the problems that will arise in human colonization activities are not limited to the status of people who carry out such colonization.