CC BY 4.0JinS TragerSC DaltonGB AguerriJAL DrewJE Falcón-BarrosoJ GänsickeBT HillV IovinoA PieriMM PoggiantiBM SmithDJB VallenariA AbramsDC AguadoDS AntojaT Aragón-SalamancaA AscasibarY BabusiauxC BalcellsM BarrenaR BattagliaG BelokurovV BensbyT BonifacioP BragagliaA CarrascoE CarreraR CornwellDJ Domínguez-PalmeroL DuncanKJ FamaeyB FariñaC GonzalezOA GuestS HatchNA HessKM HoskinMJ IrwinM KnapenJH KoposovSE KuchnerU LaigleC LewisJ LonghettiM LucatelloS Méndez-AbreuJ MercurioA MolaeinezhadA MonguióM MorrisonS MurphyDNA de ArribaLP PérezI Pérez-RàfolsI PicóS RaddiR Romero-GómezM RoyerF SiebertA SeabrokeGM SomD TerrettD ThomasG WessonR WorleyCC AlfaroEJ PrietoCA Alonso-SantiagoJ AmosNJ AshleyRP Balaguer-NúñezL BalbinotE BellazziniM BennCR BerlanasSR BernardEJ BestP BettoniD BiancoA BishopG BlomqvistM BoecheC BolzonellaM BonoliS BosmaA BritavskiyN BusarelloG CaffauE Cantat-GaudinT Castro-GinardA CoutoG Carbajo-HijarrubiaJ CarterD CasamiquelaL ConradoAM Corcho-CaballeroP CostantinL DeasonA de BurgosA De GrandiS Di MatteoP Domínguez-GómezJ DordaR DrakeA DuttaR ErkalD FeltzingS Ferré-MateuA FeuilletD FiguerasF FossatiM FranciosiniE FrascaA FumagalliM GallazziA García-BenitoR FusilloNG GebranM GilbertJ GledhillTM DelgadoRMG GreimelR GuarcelloMG GuerraJ GullieuszikM HainesCP HardcastleMJ HarrisA HaywoodM HelmiA HernandezN HerreroA HughesS IrsicV JablonkaP JarvisMJ JordiC KondapallyR KordopatisG KrogagerJK La BarberaF LamMI LarsenSS LemasleB LewisIJ LhoméE LindK LodiM LongobardiA LonoceI MagriniL ApellánizJM MarchalO MarcoA MartinNF MatsunoT MaurogordatoS MerluzziP Miralda-EscudéJ MolinariE MonariG MorelliL MottramCJ NaylorT NegueruelaI OñorbeJ PancinoE PeiraniS PeletierRF PozzettiL RainerM RamosP ReadSC RossiEM RöttgeringHJA Rubiño-MartínJA SabaterJ San JuanJ SannaN SchalligE SchiavonRP SchultheisM SerraP ShimwellTW Simón-DíazS SmithRJ SordoR SoriniD SoubiranC StarkenburgE SteeleIA StottJ StuikR TolstoyE TortoraC TsantakiM Van der SwaelmenM van WeerenRJ VerganiD VerheijenMAW VerroK VinkJS VioqueM WalcherCJ WaltonNA WeggC WeijmansAM WilliamsWL WilsonAJ WrightNJ Xylakis-DornbuschT YouakimK ZibettiS ZuritaCHAINES CHRISTOPHER PAULLorenzo Morelli2025-06-052025-06-0520240035-8711https://hdl.handle.net/20.500.12740/22691WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFU. These fibre systems feed a dual-beam spectrograph covering the wavelength range 366-959nm at R similar to 5000, or two shorter ranges at . After summarizing the design and implementation of WEAVE and its data systems, we present the organization, science drivers, and design of a five- to seven-year programme of eight individual surveys to: (i) study our Galaxy's origins by completing Gaia's phase-space information, providing metallicities to its limiting magnitude for similar to 3 million stars and detailed abundances for similar to 1.5 million brighter field and open-cluster stars; (ii) survey similar to 0.4 million Galactic-plane OBA stars, young stellar objects, and nearby gas to understand the evolution of young stars and their environments; (iii) perform an extensive spectral survey of white dwarfs; (iv) survey similar to 400 neutral-hydrogen-selected galaxies with the IFUs; (v) study properties and kinematics of stellar populations and ionized gas in z < 0.5 cluster galaxies; (vi) survey stellar populations and kinematics in field galaxies at 0.3 less than or similar to z less than or similar to 0.7; (vii) study the cosmic evolution of accretion and star formation using >1 million spectra of LOFAR-selected radio sources; and (viii) trace structures using intergalactic/circumgalactic gas at z > 2. 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