Humanitarian activities related to natural disaster management and humanitarian operations have increased since 2020, when this period became the most prominent case in the last two decades. The role of humanitarian organizations and their supply chains is critical in prevention, response, and recovery. This study evaluates the maturity level of the current supply chain condition in handling humanitarian operations and disaster management by the ACT Foundation as an Indonesian Humanitarian Organization. This study applies a maturity assessment model with five levels and case studies from the ACT Foundation in three different areas. Analyzing the 14 dimensions of maturity assessment and 81 processes of the ACT Foundation for South Tangerang and Tangerang District branches, only the dimensions of goals and performance, human resource management, and services to residents have a maturity level between 3 Intermediate and 4 Advanced. The results of the maturity level are below 2 Elementary for the South Tangerang and Tangerang Regency branches, namely focusing on the disaster phase, strategic planning, transportation and capacity planning, search and rescue processes, and support operations. The results of the maturity level of the Head Office Jakarta assessment with a value below level 3 are information and data management and continuous improvement and collaboration. This study ensures that the humanitarian supply chain has reached the appropriate maturity level, namely level 4 Advanced to 5 Optimized. Improvements in the humanitarian supply chain focus on the maturity dimension with a maturity level of less than 4 Advanced, with a management approach and operational strategies.