The culture of marriage varies from region to region, influenced by religion, customs, and community environment. One of them is the Merarik culture of the Sasak tribe in Lombok. This study aims to analyze the settlement of underage marriages and their legal consequences in the Merarik culture of the Sasak tribe in Merembu Village, West Lombok. The research method uses empirical legal methods and qualitative approaches with primary data from the research location and secondary data from reliable sources. Data collection techniques include observation, interviews, and document studies. The results showed that the process of settling underage marriages was carried out through negotiations and mediation involving village heads, religious leaders, and local communities. The legal consequences affect marital status, husband and wife, children, and property. Unregistered marriages are not recognized by the state, so the wife loses her rights if abandoned, divorced, or the husband dies. The child of the marriage only has a legal relationship with the mother and the mother's family, without a legal relationship with the father. Therefore, it is recommended that authorized institutions provide counseling on the importance of state-recognized marriages to prevent adverse effects in the future.