Kula, also known as the Kula exchange or Kula ring, is a ceremonial exchange system conducted in the Milne Bay Province of Papua New Guinea. The Kula ring was made famous by the father of modern anthropology, Bronisław Malinowski, who used this test case to argue for the universality of rational decision-making and for the cultural nature of the object of their effort. Malinowski's seminal work on the topic, Argonauts of the Western Pacific (1922), directly confronted the question, "Why would men risk life and limb to travel across huge expanses of dangerous ocean to give away what appear to be worthless trinkets?" Malinowski carefully traced the network of exchanges of bracelets and necklaces across the Trobriand Islands, and established that they were part of a system of exchange (the Kula ring), and that this exchange system was clearly linked to political authority.

Malinowski's study became the subject of debate with the French anthropologist, Marcel Mauss, author of The Gift ("Essai sur le don", 1925). Since then, the Kula ring has been central to the continuing anthropological debate on the nature of gift-giving, and the existence of gift economies.