An assembly is a group of members of an organization that meets periodically to make decisions about a specific area or scope of the organization.

Assemblies hold meetings, some of which are private and others open. If they are open, it is possible to participate in them (for example: participate if capacity allows, add items to the agenda, or comment on the proposals and decisions made by this body).

Examples: General Assembly (which meets once a year to define the main lines of action of the organization, as well as its executive bodies by vote), an advisory council for equality (which meets every two months to present proposals on how to improve gender relations in the organization), an evaluation committee (which meets every month to monitor a process), or a guarantee body (which collects incidents, abuses, or proposals to improve decision-making procedures) are examples of assemblies.