A National Spiritual Assembly is the nine member elected body governing the Baha'i community of an entire country, or in some cases a group of countries. It is elected annually by delegates, who are themselves chosen by the believers at regional conventions, so the national body is elected indirectly while the local ones are elected directly.
Its work is national in scale: coordinating the community across the country, administering national funds and properties, publishing, and representing the community to government, media and other religious bodies. Where a national Baha'i community has legal standing it is generally the Assembly that holds it.
Like every Baha'i administrative body it has no president or chairperson with authority outside its own consultative decisions, and it acts only as a body of nine. The first National Spiritual Assemblies were formed in the 1920s and 1930s, in the United States, Canada, the United Kingdom, Germany, India and Egypt, as communities outside Iran grew large enough to need national coordination. They now exist in most countries of the world, and their formation in a country is a standard measure of a national Baha'i community's development.
The indirect method exists for a practical reason. A national community may be spread across a country too large for every believer to gather, so the electoral units send representatives instead, and the number of delegates a country returns is set by the Universal House of Justice in proportion to the size of its community. The principle of an election without nomination or campaigning is carried through unchanged at every level.