Administrative geography of the United Kingdom

The administrative geography of the United Kingdom is intricate, layered, and inconsistent across its constituent nations. As a sovereign state located northwest of continental Europe, the United Kingdom comprises England, Northern Ireland, Scotland, and Wales. Each of these nations operates its own distinct system of local government and territorial divisions. As a result, there is no single, unified layer of administrative units that spans the entire United Kingdom.

As there is no written document that comprehensively encompasses the British constitution, and owing to a convoluted history of the formation of the United Kingdom, a variety of terms are used to refer to its constituent parts, which are sometimes called the four countries of the United Kingdom. The four are sometimes collectively referred to as the Home Nations, particularly in sporting contexts. Although the four countries are important for legal and governmental purposes, they are not comparable to administrative subdivisions of most other countries.

The United Kingdom also contains 17 dependent territories which are not officially a part of the UK but are represented by it in places like the UN.

Historically, the subnational divisions of the UK have been the county and the ecclesiastical parish, while following the emergence of a unified parliament of the United Kingdom, the ward and constituency have been pan-UK political subdivisions. More contemporary divisions include Lieutenancy areas and the statistical territories defined with the modern International Territorial Level (formerly NUTS) and ISO 3166-2:GB systems.