非营利机构（英语：Nonprofit Organization，NPO）是指不以营利为目的组织或团体，它的目标通常是支持或处理个人关心或者公众关注的议题或事件，因此其所涉及的领域非常广，从艺术、慈善、教育、政治、公共政策、宗教、学术、环保等，分别担任起弥补社会需求与政府供给间的落差。

实际上非营利组织的运作与企业一样是需要产生利益，但区别在于非营利组织是为组织倡导的服务对象和服务内容而产生利益，这一点通常被视为这类组织的主要特性。然而，某些专家认为将非营利组织和企业区分开来的最主要差异是：非营利组织受到法律或道德约束，不能将盈余分配给拥有者或股东，因而具有独立、公共、民间等特性。

A nonprofit organization (NPO, also known as a non-business entity) is an organization whose purposes are other than making a profit. A nonprofit organization is often dedicated to furthering a particular social cause or advocating for a particular point of view. In economic terms, a nonprofit organization uses its surplus revenues to further achieve its purpose or mission, rather than distributing its surplus income to the organization's shareholders (or equivalents) as profit or dividends. This is known as the distribution constraint. The decision to adopt a nonprofit legal structure is one that will often have taxation implications, particularly where the nonprofit seeks income tax exemption, charitable status and so on.