Unincorporated association

An unincorporated association is a group of people in common law jurisdictions—such as the United Kingdom, Canada, and New Zealand—who organize around a shared purpose without forming a corporation or similar legal entity. Unlike in some civil law systems, where associations gain legal personality upon registration, these groups lack such status and arise from contract rather than (as in the case of companies) administrative fiat.

Source: Wikipedia — Unincorporated association (CC BY-SA 4.0)