A pie is a baked food, with a shell usually made of pastry.

PIE is an abbreviation of Proto-Indo-European language, the reconstructed common ancestor of the Indo-European language family.

Pie or PIE may also refer to:

• Pie (surname), people with this surname
• Pie Allen (1818–1899), American prospector, businessman, and politician
• Pie Corbett (born 1954), English educational writer and poet
• Pie Geelen (born 1972), Dutch freestyle swimmer
• Pié Masumbuko (born 1931), Burundian politician
• Pie Nizeyimana (born 1983), Rwandan politician
• Pie Ntavyohanyuma (fl. 2007–2015), Burundian politician
• Pie Traynor (1898–1972), American professional baseball player, manager, scout and radio broadcaster

• Pie, West Virginia, an unincorporated community in the United States
• Pie Corner, a community in the parish of Saint Lucy, Barbados
• Pie Creek, a rural locality in the Gympie Region, Queensland, Australia
• Pie Island, an island in Lake Superior, Ontario, Canada

• "Pie" (song), by Future, 2017
• "The Pie", a 1972 song by Sutherland Brothers & Quiver

• "The Pie" (Seinfeld), a 1994 Seinfeld episode
• "The Pie", a 2011 Bananas in Pyjamas episode
• PIE (TV channel), a Philippine free-to-air television channel
• Pie (Entourage), an episode of the TV series Entourage

• Pie family, in the My Little Pony: Friendship Is Magic animated television series
• A character in the manga series Pie (Tokyo Mew Mew)
• "The Pie", a piebald horse in the book and film National Velvet

• Android Pie, version 9 of Android mobile operating system
• Pie menu, a circular context menu
• Pocket Internet Explorer, a browser for Windows CE
• Position-independent executable, code that can execute anywhere in memory

• Pied Pierrot or Pie, a butterfly genus
• Post Irradiation Examination, of spent nuclear fuel
• Proximity, Immediacy, Expectancy: principles for treating combat stress reaction
• U1A polyadenylation inhibition element (PIE), an RNA element

• Collingwood Football Club, Australia, nicknamed "The Pies"
• Juventud Uruguaya de Pie, a former far-right youth organization
• Pacific International Enterprises, a film production company and distributor
• Paedophile Information Exchange, a UK 1974–1984 pro-paedophilia group
• Pioneers in Engineering, a student-run organization based at the University of California, Berkeley

• Indian pie, a former Indian unit of currency
• Pan Island Expressway, Singapore
• PIE, IATA airport code and FAA location identifier for St. Pete–Clearwater International Airport, Florida
• Pie, in Spanish customary units a unit of length
• Pie (loa), a type of spirit in Vodun/Voodoo religion
• Pie Magazine, a Canadian luxury lifestyle magazine
• PIE method (Problem, Intervention, Evaluation), a method of documentation in nursing
• Prevention of Illegal Eviction from and Unlawful Occupation of Land Act, 1998, a South African law
• Principle of inclusion and exclusion, a counting technique in mathematics
• ISO 639:pie, the language code for the Piro Pueblo language

• All pages with titles containing Pie
• All pages with titles beginning with Pie
• Pi (disambiguation)
• Pieing, the act of throwing a pie at someone
• Pye (disambiguation)