The United Nations Office for the Coordination of Humanitarian Affairs (OCHA) is an agency of the United Nations that is responsible for coordinating and mobilizing humanitarian efforts globally. Headquartered in New York City, OCHA was established in 1991 following a series of humanitarian crises in the 1980s, with the aim of improving the coordination of humanitarian assistance and promoting a more effective response to emergencies. OCHA's headquarters is located in the United Nations Secretariat building, which is situated on the East River in Manhattan, New York.

This iconic building serves as the main administrative and operational hub for the organization, housing various divisions and units that facilitate its global operations. OCHA offers a range of products and services aimed at coordinating humanitarian assistance in times of crisis. This includes providing support and guidance to humanitarian actors involved in emergency response, advocating for the rights and protection of affected populations, and promoting effective coordination between governments, NGOs, and other stakeholders.

Operating on a global scale, OCHA works in partnership with various UN agencies, non-governmental organizations, and governments to address humanitarian crises worldwide. It has a network of field offices across the globe, enabling it to respond quickly and efficiently to emergencies. OCHA also works closely with local actors and communities to ensure that humanitarian interventions are tailored to specific needs and contexts.

As a specialized agency of the United Nations, OCHA has a strong market position in the humanitarian sector. Its coordination and advocacy efforts have helped shape international humanitarian policies and practices, making it a key player in emergency response and disaster management. While there may be other organizations and agencies working in the same field, OCHA's position as a UN agency gives it a unique standing and authority.

In terms of major events or achievements, OCHA has played a significant role in coordinating humanitarian responses to numerous crises, including the Syrian civil war, the Rohingya refugee crisis, and the Ebola outbreak in West Africa. These efforts have helped save countless lives and alleviate suffering in the face of complex emergencies. As of the latest information available, OCHA continues to operate as a vital component of the United Nations' humanitarian response system.

It remains focused on its mandate of coordinating and mobilizing assistance to help those affected by crises and disasters around the world. OCHA's work is ongoing, with the organization adapting to new challenges and emerging needs in an ever-changing global landscape