In the social sciences, a gift economy (or gift culture) is a society where valuable goods and services are regularly given without any explicit agreement for immediate or future rewards (i.e. there is no formal quid pro quo). Ideally, simultaneous or recurring giving serves to circulate and redistribute valuables within the community. The organization of a gift economy stands in contrast to a barter economy or a market economy. Informal custom governs exchanges, rather than an explicit exchange of goods or services for money or some other commodity.

There are various social theories concerning gift economies. Some consider the gifts to be a form of reciprocal altruism. Another interpretation is that social status is awarded in return for the 'gifts'. Consider for example, the sharing of food in some hunter-gatherer societies, where food-sharing is a safeguard against the failure of any individual's daily foraging. This custom may reflect altruism, it may be a form of informal insurance, or may bring with it social status or other benefits.