In English law (and other countries which adopt the rule), the cab-rank rule is the obligation of a barrister to accept any work in a field in which he professes himself competent to practise, at a court at which he normally appears, and at his usual rates. The rule derives its name from the tradition by which a Hackney carriage driver at the head of a queue of taxicabs is supposed to take the first passenger requesting a ride.
Paragraph 602 of the Code of Conduct of the Bar of England and Wales states:
A self-employed barrister must comply with the "Cab-rank rule" and accordingly except only as otherwise provided in paragraphs 603 604 605 and 606 he must in any field in which he professes to practise in relation to work appropriate to his experience and seniority and irrespective of whether his client is paying privately or is publicly funded:
(a) accept any brief to appear before a Court in which he professes to practise;
(b) accept any instructions;
(c) act for any person on whose behalf he is instructed;
and do so irrespective of (i) the party on whose behalf he is instructed (ii) the nature of the case and (iii) any belief or opinion which he may have formed as to the character reputation cause conduct guilt or innocence of that person.
In the absence of such a rule, it might be difficult for an unpopular person to obtain legal representation, and barristers who act for such people might be criticised for doing so.
In 1999, Lord Irvine, the then Lord Chancellor, said: "The "cab-rank" rule is one of the glories of the Bar. It underscores that every member of the Bar is obliged, without fear or favour, to represent clients who offer themselves, regardless of how unpopular they may be in the community or elsewhere."
The cab-rank rule is not universally admired; and, in 2010, the Law Society of England and Wales said, "The Society questions whether the cab-rank rule remains a necessary and proportionate rule for the Bar at a time when there is increasing competition for advocacy services." 
- "Part VI - Acceptance and Return of Instructions". Code of Conduct of the Bar of England & Wales. Bar Standards Board. 31 March 2010. Retrieved 28 June 2011.
- "28 January 1999". Lord Irvine, Lord Chancellor. Parliamentary Debates (Hansard) (House of Lords). col. 1150.
- "Summary of Responses to the Bar Council 2010 Consultation on Contractual Terms of Work for the supply of Legal Services by Barristers to Solicitors". General Council of the Bar. 2010. p. 19. Retrieved 28 June 2011.
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