| Unbeknownst Entertainment |
| Unbelievable Universe |
| Unbound |
| Unbound Digital |
| Unbridled Books |
| Uncanny Books |
| Uncanny Magazine |
| Uncanny Publishing |
| Uncial Press |
| Uncivilized Books |
| Uncle B. Publications |
| Uncle Henry Books |
| Uncle River |
| Uncomfortably Dark Horror |
| Uncommon Universes Press |
| uncredited |
| Undaunted Press |
| Undaunted Publishing |
| Undead in the Head |
| Undead Press |
| Undead Pub. |
| Undead Tree Publications |
| Under the Floorboards |
| Under the Moon |
| Under the Volcano |
| Underbelly Books |
| Undergraduate Report, Worcester Polytechnic Institute |
| Undergrove Press |
| Underhill Books |
| Underland Press |
| Underline Publishing |
| Underlined |
| Undermountain Books |
| Undertow Publications |
| Underwood Books |
| Underwood Books / SFBC |
| Underwood-Miller |
| Underwood-Miller / SFBC |
| Underwords Press |
| Underworld |
| Underworld Amusements |
| Underworlds Magazine |
| Undie Press c/o Tim Hall |
| Undrentide |
| Uneak Press, Inc. |
| Unearth Publications |
| Unearthly Tales |
| Unfading Daydream |
| Unfading Press |
| Unfiltered Creative |
| Ungar |
| Unger |
| Uni Book / Modern Promotions |
| Unibook |
| Unibook / Modern Promotions |
| Única |
| Unicorn & Son |
| Unicorn & Son / Borgo Press |
| Unicorn Books |
| Unicorn Books (Australia) |
| Unicorn Bookshop |
| Unicorn Press |
| Unicorn Press (I) |
| Unicorn Productions |
| Unicorn Publishing Group |
| Unicorn Publishing House |
| Unicorn-Star Press |
| Unicórnio Azul |
| Unidad Editorial |
| Unidea |
| Unieboek |
| Unifont |
| Unikornis kiadó |
| Uninvited Books |
| Union |
| Union Deutsche Verlagsgesellschaft |
| Union générale d'éditions |
| Union Mundial pro Interlingua |
| Union Square & Co. |
| Union Square Kids |
| Union Street Press |
| Unión tipográfica, Muñoz Plaza y cía, Guatemala |
| Unionsverlag |
| unipublish |
| Unique Graphics |
| Unitall |
| United Amateur Press Association |
| United Authors |
| United Authors Association |
| United Book Guild |
| United Corporations of Canada |
| United Faedom Publishing |
| United Fans / Klub Julese Vernea |
| United Mythologies Press |
| United Press |
| United Press, Ltd. |
| United Publications |
| United States Book Co. |
| United Workers of Greenwich |
| United Writers Publications |
| Unity Press |
| Unity School of Christianity |
| Unity Tract Society |
| Univelt |
| Universal |
| Universal (US) |
| Universal Distributors |
| Universal Library |
| Universal Media |
| Universal Paperbacks |
| Universal Publishers |
| Universal Publishing & Distributing Corporation |
| Universal Studios |
| Universal-Tandem |
| Universal-Tandem Publishing Company Ltd. |
| Universalis Publishing Limited |
| Universe Books |
| Universe Publishing |
| Universe Publishing / SFBC |
| Universidad de Almería |
| Universidad de Guadalajara |
| Universidad de León, Servicio de Publicaciones |
| Universidad del País Vasco |
| Universidad Nacional Autónoma de México |
| Universidade de Brasília |
| Universidade de Santa Catarina |
| Universidade de Vigo, Servicio de Publicacións |
| Universitas |
| Universitas Press |
| Universitat Politècnica de Catalunya |
| Université du Québec |
| Universitetsforlaget |
| University Books |
| University College Dublin Press |
| University Editions |
| University Microfilms |
| University of Alabama Press |
| University of Alaska Press |
| University of Alberta Press |
| University of Arkansas Press |
| University of British Columbia Press |
| University of British Columbia Science Fiction Society |
| University of Calgary Press |
| University of California Press |
| University of California, Berkeley |
| University of California, Los Angeles |
| University of California, Riverside |
| University of Chester Press |
| University of Chicago Press |
| University of Connecticut Bookstore |
| University of Constantinople Press / Hague Publishing |
| University of Copenhagen |
| University of Delaware Press |
| University of Detroit |
| University of Durham |
| University of Exeter Press |
| University of Florida Press |
| University of Georgia Press |
| University of Hawai'i Press |
| University of Hawaii Press |
| University of Illinois Press |
| University of Illinois, Urbana-Champaign |
| University of Iowa |
| University of Iowa Press |
|
| University of Kansas |
| University of London Press |
| University of London Press & Hodder & Stoughton |
| University of Maine Press |
| University of Manitoba |
| University of Maryland |
| University of Maryland Department of Art |
| University of Maryland Science Fiction Society |
| University of Maryland SF Society |
| University of Massachusetts at Amhurst Science Fiction Society |
| University of Massachusetts Press |
| University of Memphis |
| University of Michigan Press |
| University of Michigan Press / Petoskey Publishing |
| University of Minnesota Press |
| University of Missouri Press |
| University of Nebraska Press |
| University of Nebraska Press / SFBC |
| University of Nevada Press |
| University of New Mexico Press |
| University of New Orleans Press |
| University of New South Wales |
| University of North Carolina at Chapel Hill |
| University of North Carolina at Greensboro |
| University of North Carolina Press |
| University of North Georgia |
| University of North London Press |
| University of North Texas Press |
| University of Notre Dame |
| University of Notre Dame Press |
| University of Notre Dame Press / The Harvester Press |
| University of Oklahoma Press |
| University of Oregon |
| University of Ottawa Press |
| University of Papua New Guinea Press |
| University of Pennsylvania Press |
| University of Pittsburgh Press |
| University of Queensland Press |
| University of Rochester Press |
| University of Santo Tomas Publishing House |
| University of South Carolina Press |
| University of Southern Mississippi |
| University of Suffield Press |
| University of Tampa Press |
| University of Tennessee Press |
| University of Texas at Austin |
| University of Texas Press |
| University of Texas Press / BCE |
| University of the Philippines Press |
| University of the West Indies Press |
| University of Tokyo Press |
| University of Toronto Press |
| University of Uppsala |
| University of Utah |
| University of Vermont / University Press of New England |
| University of Victoria |
| University of Virginia Press |
| University of Wales Press |
| University of Warsaw Press |
| University of Washington Bookstore |
| University of Washington Press |
| University of Western Australia Press |
| University of Wisconsin Press |
| University of Wollongong |
| University Press (Ibadan) |
| University Press (New Hyde Park) |
| University Press of America |
| University Press of Colorado |
| University Press of Florida |
| University Press of Kansas |
| University Press of Kentucky |
| University Press of Mississippi |
| University Press of New England |
| University Press of the Pacific |
| University Press of Virginia |
| University Publishing Co. |
| University Publishing Company |
| University Publishing House |
| University Studio Press |
| University Tutorial Press (London) |
| Universo dos Livros |
| Universo Geek |
| Universtiy of Northern Iowa |
| Univocal Publishing |
| unknown |
| Unknown Country |
| Unlikely Story, LLC |
| UnlikelyConvergence |
| Unlimited Publishing |
| Unlocking Press |
| Unnameable Press |
| Unnerving |
| UNO Press |
| Unquiet Grave |
| Unrast |
| Unreal Books |
| UnScripted |
| Unseen Books |
| Unseen Press |
| Unsettling Reads |
| Unsolicited Press |
| Unspeakable Press |
| Unspeakable Tomes |
| Unspeakable Tomes / Aporia Press |
| Unstuck Books |
| Unsung Fu Publishers |
| Unsung Stories |
| Untamed Spirit Publishing |
| Untethered Realms |
| Unthank Books |
| Untimely Books |
| Untold Press |
| Untold Stories |
| Untreed Reads Publishing |
| Unum |
| Unusually Tall Stories |
| Unveiling Nightmares |
| Unwin |
| Unwin Bros. |
| Unwin Hyman |
| Unwin Paperbacks |
| Unwin Paperbacks / Unwin Hyman |
| UnWrecked Press |
| Unzipped Books / Lethe Press |
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