The International Court of Justice (ICJ) has its seat in The Hague, and is the principal judicial organ of the United Nations. It was established in June 1945 by the Charter of the United Nations and began work in April 1946.
The Court’s role is to settle, in accordance with international law, legal disputes submitted to it by States and to give advisory opinions on legal questions referred to it by authorized United Nations organs and specialized agencies.
The Court is composed of 15 judges, who are elected for terms of office of nine years by the United Nations General Assembly and the Security Council.
You can access the cases and advisory opinions online via the ICJ website, and via WorldLII.
You can also the judgments via various online services including:
Westlaw - select Services and then International Materials and use the International Materials Index to find the ICJ materials