R. or r. may refer to: * ''

Reign A reign is the period of a person's or dynasty's occupation of the office of monarch of a nation (e.g., King of Saudi Arabia, Saudi Arabia, List of Belgian monarchs, Belgium, Co-princes of Andorra, Andorra), of a people (e.g., List of Frankish kin ...

'', the period of time during which an Emperor, king, queen, etc., is ruler * '' Rex'', abbreviated as R., the Latin word meaning King * ''Regina'', abbreviated as R., the Latin word meaning

Queen Queen most commonly refers to: * Queen regnant, a female monarch of a kingdom * Queen consort, the wife of a reigning king * Queen (band), a British rock band Queen or QUEEN may also refer to: Monarchy * Queen dowager, the widow of a king * Q ...

* or , abbreviated as r., used in

historiography Historiography is the study of the methods used by historians in developing history as an academic discipline. By extension, the term ":wikt:historiography, historiography" is any body of historical work on a particular subject. The historiog ...

to designate the ruling period of a person in dynastic power, to distinguish from his or her lifespan (e.g. "Charles V (r. 1519–1556)") * Abbreviation R., meaning ''Rex'' or ''Regina.'' Commonly used for criminal prosecution in

Commonwealth realm A Commonwealth realm is a sovereign state in the Commonwealth of Nations that has the same constitutional monarch and head of state as the other realms. The current monarch is King Charles III. Except for the United Kingdom, in each of the re ...

s where offences are brought in the name of the monarch (e.g. ''"R. v Defendant"'') * '' R.'', an album by American singer R. Kelly

See also