Rule or ruling may refer to:

Education

* Royal University of Law and Economics (RULE), a university in Cambodia

Human activity

* The exercise of political or personal control by someone with authority or power * Business rule, a rule pertaining to the structure or behavior internal to a business * School rule, a rule that is part of school discipline * Sport rule, a rule that defines how a sport is played * Game rule, a rule that defines how a game is played * Moral, a rule or element of a moral code for guiding choices in human behavior * Norm (philosophy), a kind of sentence or a reason to act, feel or believe * Rule of thumb, a principle with broad application that is not intended to be strictly accurate or reliable for every situation * Unspoken rule, an assumed rule of human behavior that is not voiced or written down * Slide rule, a mechanical analog computer

Science

* Rule of inference or transformation rule, a term in logic for a function which takes premises and returns a conclusion * Phrase structure rule or rewrite rule, used in some theories of linguistics * "Rule ''X''" elementary cellular automaton, where X is a number between 0-255 characterizing a specific model (e.g. ''Rule 110'') * Ruler, or "rule"; a distance measuring device * Phonological rule * Social norm, explicit or implicit rules used within society or by a group

Law and government

* Advance tax ruling, a tool for conforming taxation arrangements * Court order, a decision by a court * Government * In rulemaking by the federal government of the United States, a regulation mandated by Congress, but written or expanded upon by the executive branch * Law, which may informally be called a "rule" * Military dictatorship, Military rule, governance by a military body * Monastic rule, a collection of precepts that guides the life of monks or nuns in a religious order * Procedural law, a ruleset governing the application of laws to cases * Rule of law, government based not on arbitrary decisions of officials but on laws

Geography

* Rule, Arkansas * Rule, Texas

Literature

* ''The Rules'', bestselling self-help book * Rules (novel), ''Rules'' (novel), 2007 Newbery Honor book by Cynthia Lord * "The Rulers", a science fiction short story by A. E. van Vogt

Music

* Ja Rule (born 1976), hip hop artist

Albums

* ''R.U.L.E.'', by Ja Rule, 2004 * ''Rule'', by Anna Tsuchiya, 2010 * Rules (album), ''Rules'' (album), by the Whitest Boy Alive, 2009 * ''Rules'', by First Blood (band), First Blood, 2017 * ''Rules!'', by Manila Luzon, 2019

Songs

* Rule (Nas song), "Rule" (Nas song), 2001 * Rule/Sparkle, "Rule"/"Sparkle", a double A-side by Ayumi Hamasaki, 2009 * "Rule", by X Ambassadors from ''Orion (X Ambassadors album), Orion'', 2019 * Rules (Doja Cat song), "Rules" (Doja Cat song), 2019 * Rules (KMFDM song), "Rules" (KMFDM song), 1996 * "Rules", by Shakira from ''Laundry Service'', 2001

Other uses

* Rule (surname) * The Rule (film), ''The Rule'' (film), a 2014 American documentary * Ruler (film), ''Ruler'' (film), a 2019 Telugu-language film * ''Rules: Pyaar Ka Superhit Formula'', a 2003 Bollywood film * rule: a snippet of code which can perform email filtering * Rule (horse) (born 2007), American racehorse * Rules (restaurant), upscale English restaurant in London * ''Rules!'', a 2014 iOS video game * Rule 1 (Batwoman), "Rule #1" (''Batwoman'') * Rule (Bosnia and Herzegovina), political party