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In the United Kingdom, the four Boundary Commissions are responsible for determining the boundaries of House of Commons constituencies. There is one Boundary Commission each for England, Scotland, Wales (Welsh: Comisiwn Ffiniau i Gymru), and Northern Ireland. The Commissions are currently established under the Parliamentary Constituencies Act 1986 (as amended by the Boundary Commissions Act 1992), although they were first established under early legislation after the Second World War. The Boundary Commissions will cease to exist after they complete their present review. Their functions will be transferred to the United Kingdom Electoral Commission.

The Commissions conduct a review once every eight to twelve years. There are four members of each Commission, of which three actually take part in meetings. The Speaker of the House of Commons is the ex officio Chairman of each Boundary Commission, though he takes no actual part in the proceedings. The Deputy Chairman of a Commission, who actually presides over Commission meetings, is always a Justice in a British court.

Once in 8-12 years, the Commission conducts a complete review of all constituencies. In between general reviews, the Commission conducts interim reviews, considering one geographic area at a time. The interim reviews usually do not yield drastic changes in boundaries, while the general reviews often do. As of August 2007, the latest review was given effect by The Parliamentary Constituencies (England) Order 2007, with the new boundaries to be used for the next general election.

Under the rules established by Parliament, the number of constituencies in Great Britain (England, Wales, and Scotland) must not be "substantially greater or less" than 613, of which at least 35 must be in Wales. The City of London must not be partitioned and must be included in a seat that refers to it by name. The Orkney and Shetland islands may not be combined with any other areas. Northern Ireland may include 16-18 constituencies.

The Boundary Commissions are required by law to take local government boundaries into account when determining constituencies. The Commission, however, may choose to deviate from this requirement if failing to do so would cause some constituencies to be widely disparate in size.

Once the Commission makes a report, the recommendations must be submitted to Parliament. Parliament may approve or reject these recommendations, but may not amend them. If Parliament approves the recommendations, then the sovereign makes an Order formalising the boundary changes.

• Electoral Affairs Commission

• Boundary Commission for England
• Boundary Commission for Scotland
• Boundary Commission for Wales
• Boundary Commission for Northern Ireland
• Election maps of the UK
• June 2006: Boundary changes make it more difficult for Labour to win an overall majority