The Philip C. Jessup International Law Moot Court Competition, also known as the Jessup, is the oldest and largest international moot competition in the world, attracting participants from almost 700 law schools in more than 90 countries in recent years (100 countries took part in 2018).

The competition has been described as the most prestigious moot court competition in the world by a large number of organisations and universities internationally, and is one of the grand slam or major moots.
The competition is a simulation of a fictional dispute between countries before the International Court of Justice (ICJ). It is named after Philip Jessup, who once served on the ICJ, and is organised by the International Law Students Association (ILSA)