United Nations Day, the anniversary of the 1945 Charter of the United Nations (International)

United Nations Day is an annual commemorative day, reflecting the official creation of the United Nations on 24 October 1945. In 1947, the United Nations General Assembly declared 24 October, the anniversary of the Charter of the United Nations, to "be devoted to making known to the people of the world the aims and achievements of the United Nations and to gaining their support for" its work.

The Charter of the United Nations is the foundational treaty of the United Nations (UN). It establishes the purposes, governing structure, and overall framework of the UN system, including its six principal organs: the Secretariat, the General Assembly, the Security Council, the Economic and Social Council (ECOSOC), the International Court of Justice, and the Trusteeship Council.

Lists of holidays by various categorizations.