A collective mark is a type of trade mark used by members of an association, organisation or other collective body to indicate that they belong to that group, and often that their goods or services meet standards set by it. It distinguishes the members’ goods or services from those of non‑members, rather than identifying a single commercial source.In the UK, collective marks are specifically provided for in the Trade Marks Act 1994 and Trade Marks Rules, and are registered at the UK Intellectual Property Office. Comparable provisions exist under EU-derived trade mark law applicable in Ireland and in the Irish Trade Marks Act 1996. Usage and legal treatment are broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland.The proprietor of a collective mark is usually the association itself, which must file regulations governing membership, conditions of use and sanctions for misuse. Collective marks are commonly used by professional bodies, trade associations and cooperatives.Key issues for practitioners include registrability, drafting and updating regulations, controlling use by members, enforcement against non‑members, and interaction with certification marks, passing off and competition law. Misuse or loss of control can jeopardise validity and distinctiveness.