Alpha (Α or α) is the first letter of the Greek alphabet.

Alpha or ALPHA may also refer to:

• Latin alpha (ɑ), a letter of the Latin alphabet
• ɑ, a glyph in the International Phonetic Alphabet
• ɑ, a vowel in the General Alphabet of Cameroon Languages
• Alfa, the first letter in the NATO phonetic alphabet

• Alpha (Lombard), a Franco-Belgian comics series
• The Alphas, a young-adult novel series by Lisi Harrison
• Alpha 1 through Alpha 9, anthologies edited by Robert Silverberg

• Alpha (2018 film), an American prehistoric adventure film
• Alpha (2019 film), a Bangladeshi film
• Alpha (upcoming film), an upcoming French film
• Alpha Alpha, German science fantasy series
• Alphas, an American science fiction TV series 2011–2012
• "Alpha" (The X-Files), a sixth-season episode of The X-Files
• Alpha and Omega (radio plays)
• Alpha, a Greek television channel
• Alpha, an upcoming installment in the YRF Spy Universe

• Alpha (DC Comics), a character from DC Comics
• Alpha (Marvel Comics), a character from Marvel Comics
• Alpha (The Walking Dead), an antagonist from the Walking Dead comic and TV series
• Alpha 4 (Power Rangers), Alpha 5 (Power Rangers), Alpha 6 (Power Rangers), or Alpha 7 (Power Rangers), characters in the Power Rangers universe
• Alpha the Ultimate Mutant, a character in Marvel Comics
• Moonbase Alpha (Space: 1999), the primary setting for the television series Space: 1999
• Alpha, a wolf character in the animated film Storks
• Alpha, the lead dog from the 2009 animated film Up
• Alpha Trion, an autobot character in The Transformers
• Alpha, a fictional computer in Mike Walker's radio play Alpha
• Alpha Lexa, a character from Ryan's World
• Alpha, the main antagonist of Xenoblade Chronicles 3: Future Redeemed

• Alpha (Magic: The Gathering), a card set
• Alpha (video game), released in 1986

• Airlock Alpha, a science fiction website primarily dedicated to Star Trek

• Alpha, a French early music label record label, now part of Outhere
• Alpha chord, in the octatonic scale
• Alpha (band), a British electronic music group
• Alpha (Kazakh band), a Kazakh Q-pop music group

• Alpha (Aitana album) (2023)
• Alpha (Alice Nine album) (2007)
• Alpha (Asia album) (1983)
• Alpha (Charlotte Day Wilson album) (2021)
• Alpha (CL album) (2021)
• Alpha (Jelena Karleuša album) (2023)
• Alpha (Selena y Los Dinos album) (1986)
• Alpha (Sevendust album) (2007)
• Alpha (Shenseea album) (2022)
• Alpha (War of Ages album) (2017)

• "Alpha" (song), a 2014 song by Kollegah
• "Alpha", a track on the 1976 album Albedo 0.39 by Vangelis
• "Alpha", a song by C418 from the 2013 soundtrack Minecraft – Volume Beta

• Alpha Bank, a Greek bank, or their stock symbol ALPHA
• Alpha Books, an imprint of Penguin Group
• Alpha Industries, an American clothing company
• Alpha Media, an American radio broadcasting company
• Alpha TV, a Greek terrestrial channel
• Alpha Video, an American entertainment company
• Alpha, a streaming service operated by Legendary Entertainment from 2016 to 2019
• Alpha (Australian magazine), an Australian men's sport magazine
• Alpha, an investor magazine, later incorporated into Absolute Return + Alpha

• Alpha (given name), a list of people with the name
• Elizabeth Alpha-Lavalie (1947–2013), Sierra Leonian politician
• Jenny Alpha (1910–2010), Martinique-born French actress and singer
• Alpha Lee (1994–), professor at the University of Cambridge's Department of Physics

• Alpha, California, former settlement
• Alpha, Illinois, a village
• Alpha, Iowa, an unincorporated community
• Alpha, Kentucky, an unincorporated community
• Alpha, Maryland, an unincorporated community
• Alpha, Michigan, a village
• Alpha, Minnesota, a city
• Alpha, Missouri, an unincorporated community
• Alpha, New Jersey, a borough
• Alpha, Ohio, a neighborhood of the city of Beavercreek
• Alpha, Oregon, an unincorporated community
• Alpha (Morristown, Tennessee), a neighborhood
• Alpha, Texas, an unincorporated freedman's town
• Alpha, Virginia, an unincorporated community
• Alpha, Washington, an unincorporated community
• Alpha, Wisconsin, an unincorporated community
• Alpha Ridge, Alaska, a mountain ridge

• Alpha, Queensland, a town in Australia
• Alpha Ridge, an undersea ridge in the Arctic Ocean

• Alpha (ethology) (also "alpha male" and "alpha female"), the highest ranking individuals in a community of social animals
• Alpha helixes, which are a type of secondary protein structures
• α receptors, a type of Adrenergic receptor
• SARS-CoV-2 Alpha variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19
• A class of Immunoglobulin heavy chains that defines IgA type antibodies
• Trinchesia alpha, a species of sea slug
• Ponera alpha, a species of ant

• Alpha (programming language), an early database language
• Alpha compositing, an image processing technique
• Alpha phase of a software release life cycle
• AlphaServer, DEC now HP machine successor to the VAX
• AlphaStation, DEC now HP workstation successor to the VAX
• DEC Alpha, an instruction set architecture developed by Digital Equipment Corporation (DEC)
• Wolfram Alpha, a computational knowledge engine

• Alpha (finance), a measurement of active return on an investment
• Cronbach's alpha, a statistical measure of reliability
• Angular eccentricity (conventional symbol "α")
• Navigational azimuth (symbol "α")
• One of the Feigenbaum constants describing a bifurcation diagram, in mathematics (symbol "α")
• The probability of a type I error in statistics (symbol "α")
• The significance level of a statistical test (symbol "α")
• The inverse Ackermann function
• α, sometimes used as a placeholder for ordinal numbers

• ALPHA, a particle physics experiment at CERN
• ALPHA Collaboration, (Antihydrogen Laser PHysics Apparatus), a team of scientists
• Alpha particle, form of particle radiation
• Alpha waves, recorded by electroencephalography
• Angle of attack in aerodynamics (symbol "α")
• Angular acceleration in physics (symbol "α")
• Coefficient of thermal expansion in thermodynamics (symbol "α")
• Fine-structure constant in physics (symbol "α")
• Thermal diffusivity in thermodynamics (symbol "α")
• Common-base current gain of a transistor in electronics (symbol "α")
• α, the isotope fractionation factor between two substances in geochemistry
• Alpha, the brightest star in a constellation according to the Bayer designation

• Alpha (navigation), a Russian radio navigation system
• Minolta Alpha, the Japanese name for a series of SLR cameras known as Maxxum or Dynax elsewhere
• Sony α or Sony Alpha, a digital SLR series by Sony, direct successor to the Minolta Alpha series
• Samsung Galaxy Alpha, 2014 Android smartphone by Samsung

• GM Alpha platform, the underpinning of various GM vehicles
• Alpha (sternwheeler), a 19th-century river vessel
• Advance Alpha, a Swiss paraglider design
• Alpha 2000, a light aircraft built in New Zealand
• Dassault/Dornier Alpha Jet, a French/German jet trainer aircraft
• Firefly Alpha, an orbital rocket
• Kohler Alpha, an American glider
• Pipistrel Alpha Trainer, a Slovenian light-sport aircraft

• Subtropical Storm Alpha (1972), first storm of the 1972 Atlantic hurricane season
• Tropical Storm Alpha (2005), twenty-third storm of the 2005 Atlantic hurricane season
• Subtropical Storm Alpha (2020), twenty-second storm of the 2020 Atlantic hurricane season

• ALPHA (psychedelic), a psychedelic drug
• Generation Alpha, the demographic cohort succeeding Generation Z
• Alpha course, an introductory course in Christianity
• Alpha Group, a Russian counterterrorism unit
• Alpha Secondary School, a high school in Burnaby, British Columbia, Canada
• Alpha Boys School, a school in Kingston, Jamaica
• Alpha, or Service "A", one of the uniforms of the United States Marine Corps

• All pages with titles beginning with Alpha
• All pages with titles containing Alpha
• Alpha and Omega (disambiguation)
• Alpha value (disambiguation)
• Alfa (disambiguation)
• Moonbase Alpha (disambiguation)
• A, the letter
• Space Station Alpha
• Space Complex Alpha
• Beginning (disambiguation)
• Birth (disambiguation)
• Construction (disambiguation)