Mana is the concept of an impersonal force or quality that resides in people, animals, and inanimate objects. The concept is common to many Oceanic languages, including Melanesian, Polynesian, and Micronesian.

In anthropological discourse, mana as a generalized concept has attained a significant amount of interest, often understood as a precursor to formal religion. It has commonly been interpreted as "the stuff of which magic is formed", as well as the substance of which souls are made.

Modern fantasy fiction and computer and role-playing games have adopted mana as a term for magic points—an expendable resource out of which magic users form their magical spells.

Mana should not be confused with the Biblical manna (also spelled mana or mannah), which, according to the Bible (Exodus, chapter 16), provided sustenance for the Israelites.

Mana in Polynesian culture

In Polynesian culture (for example, Hawaiian and Māori), mana is a spiritual quality considered to have supernatural origin – a sacred impersonal force existing in the universe. Therefore to have mana is to have influence and authority, and efficacy – the power to perform in a given situation. This essential quality of mana is not limited to persons – folks, governments, places and inanimate objects can possess mana. In Hawaiian, mana loa means "great power". There are two ways to obtain mana: through birth and through warfare. People or objects that possess mana are accorded "respect"; because their possession of mana gives them "authority", "power", and "prestige". In Māori, a tribe that has mana whenua is considered to have demonstrated their authority over a given piece of land or territory. The word's meaning is complex because mana is a basic foundation of the Polynesian worldview.

The magazine Maori Law Review suggests two essential aspects to a Māori person's mana:

• mana tangata, authority derived from whakapapa connections, and
• mana huaanga, defined as "authority derived from having a wealth of resources to gift to others to bind them into reciprocal obligations".

Mana in Melanesian culture

Melanesian mana is thought to be a sacred impersonal force existing in the universe. Mana can be in people, animals, plants and objects. Similar to the idea of efficacy, or sometimes better known as luck, the Melanesians thought all success was traced back to mana. One could acquire or manipulate this luck in different ways (for example through magic). Certain objects that have mana can change a person's luck.

Examples of such objects would be charms or amulets. For instance if a very prosperous hunter used a charm that had mana and he gave it to another person then people believed that the prosperous hunter's luck would transfer to the next holder of the charm.