The organ of the United Nations responsible for negotiating agreements with the specialized agencies is the

The organ of the United Nations responsible for negotiating agreements with the specialized agencies is the Economic and Social Council (ECOSOC). ECOSOC is one of the six main organs of the United Nations and is responsible for promoting international economic and social cooperation and development. It coordinates the work of the United Nations' specialized agencies and is authorized to negotiate agreements with them to ensure their activities are in line with the overall goals and policies of the United Nations. Therefore, the correct answer to the question is Economic and Social Council.