Peerages in the United Kingdom

A peerage is a form of crown distinction, with peerages in the United Kingdom comprising both hereditary and lifetime titled appointments of various ranks, which form both a constituent part of the legislative process and the British honours system within the framework of the Constitution of the United Kingdom.

The term peerage can be used both collectively, to refer to this entire body of titled nobility (or a subdivision thereof), and individually, to refer to a specific title (modern English language-style using an initial capital in the latter case but not the former). British peerage title holders are termed peers of the Realm. Lord is used as a generic term to denote members of the peerage; however, individuals who use the appellation Lord or Lady are not always necessarily peers (for example, some judicial, ecclesiastic and others are often accorded the appellation Lord or Lady as a form of courtesy title as a product of their office).

The peerage also forms the highest rung of the British nobility. This is a formal designation and not to be confused with the British upper class which is by contrast not formally structured, though many of the former may compose part of the latter. Though the modern UK is a constitutional monarchy with robust democratic elements, historically the British Isles were predisposed towards monarchial and aristocratic governance in which power was largely inherited and shared amongst a privileged monarchy and aristocracy and their families and retainers, with the later British nobility and class system having evolved out of this period.

The British monarch is considered the fount of honour and is notionally the only person who can grant peerages, though there are many conventions about how this power is used, especially at the request of the British government.

The peerage's fundamental roles today are ones of lawmaking and governance, with a peer being eligible (although formerly entitled) to a seat in the House of Lords and having eligibility to serve in a ministerial role in the government if invited to do so by the monarch or, more conventionally in the modern era, by the prime minister.

Until the creation of the Supreme Court of the United Kingdom in 2009, the peerage also formed a constituent part of the British judicial system, via the Appellate Committee of the House of Lords.