A Police Community Support Officer, or as written in legislation Community Support Officer, is a uniformed member of police staff in England and Wales, a role created by Section 38(2) of the Police Reform Act 2002, which was given Royal Assent by Queen Elizabeth II on 24 July 2002. They are not warranted, but hold a variety of police powers and the power of a constable in various instances by the forty-three territorial police forces in England and Wales and the British Transport Police.

A warrant card is proof of identification and authority carried by police officers and some other law enforcement officers including immigration officers and Approved Mental Health Professionals. The term is normally used only within the United Kingdom and in current and former Commonwealth countries. Many other countries refer to their equivalent of warrant cards simply as police credentials, commission books, or identification cards. In the UK MI5 officers also have warrant cards. Specially trained mental health practitioners called Approved Mental Health Professional are also warranted council officers and carry warrant cards when acting under the Mental Health Act 1983.