| 3701 |  | Ultimate Wrestling Federation | Colbert, Georgia, USA | 2022- | | |
| 3702 |  | Ultimate Wrestling Israel | Israel | 2015-2017 | | |
| 3703 |  | Ultimate Xtreme Wrestling Alliance | Brooklyn, Ohio, USA | 2014-2019 | | |
| 3704 |  | Ultra Championship Wrestling | Rapid City, South Dakota, USA | 1998-2005 | | |
| 3705 |  | Ultra Championship Wrestling Zero | Salt Lake City, Utah, USA | 2002- | | |
| 3706 |  | UltraWrestle | South Carolina, USA | 2014-2016 | | |
| 3707 |  | Un Employment Pro Wrestling | Tokyo, Japan | 2016- | | |
| 3708 |  | Uncanny Attractions: Drags And Dropkicks | Austin, Texas USA | 2018- | | |
| 3709 |  | Under The Lights Entertainment | Marinette, Wisconsin, USA | 2014- | | |
| 3710 |  | Underground Empire Wrestling | California, USA | 2000-2021 | | |
| 3711 |  | Underground Pro Wrestling | Calp, Alicante, Spanien | 2016-2022 | | |
| 3712 |  | Underground Wrestling Alliance | San Jose, California, USA | 2011- | | |
| 3713 |  | Underground Wrestling Alliance | River Rouge, Michigan, USA | 1998-2002 | | |
| 3714 |  | Underground Wrestling EXIT | Tokyo, Japan | 2008- | | |
| 3715 |  | Underground Wrestling Revolution | Cheltenham, Gloucestershire, England, UK | 2017-2018 | | |
| 3716 |  | Underground Wrestling Society | Michigan, USA | 2016-2017 | | |
| 3717 |  | Underworld Wrestling | Melbourne, Victoria, Australia | 2018-2019 | | |
| 3718 |  | Undisputed Wrestling Entertainment | Boston, Massachusetts, USA | 2009- | | |
| 3719 |  | Unified Championship Wrestling | Rhode Island, USA | 1998-2000 | | |
| 3720 | | Unified Championship Wrestling | Alabama, USA | 1998 | | |
| 3721 |  | Unified Championship Wrestling | Christchurch, Canterbury, New Zealand | 2017- | | |
| 3722 |  | Unified PRO Wrestling | Oshawa, Ontario, Canada | 2023- | | |
| 3723 |  | Unified Wrestling Oklahoma | Bethany, Oklahoma, USA | 2020- | | |
| 3724 |  | Unify Championship Entertainment | Honolulu, Hawaii, USA | 2018- | | |
| 3725 |  | Union Independent Pro Wrestling | Los Angeles, California, USA | 2009-2019 | | |
| 3726 |  | Union Of European Wrestling Alliances | Europa | 2009- | | |
| 3727 |  | Union Of Independent Professional Wrestlers | Toronto, Ontario, Canada | 2003-2019 | | |
| 3728 |  | Union Pro Wrestling | Tokyo, Japan | 2014-2015 | | |
| 3729 |  | Union Pro Wrestling | Kagoshima, Japan | 1994-1995 | | |
| 3730 |  | Union Veracruzana de Lucha Libre | Ciudad y Puerto de Veracruz, Veracruz, Mexiko | 2009- | | |
| 3731 |  | Unique Wrestling Experience | San Juan, Puerto Rico | 2023- | | |
| 3732 |  | Unite X Conquer | England, UK | 2017-2020 | | |
| 3733 | | United Championship Wrestling | Winnipeg, Manitoba, Canada | 1992-1993 | | |
| 3734 |  | United Elite Wrestling | Richmond, Virginia, USA | 2019-2023 | | |
| 3735 |  | United Japan Pro-Wrestling | Tokyo, Japan | 2024- | | |
| 3736 |  | United Kingdom Pro Wrestling | South East England, England, UK | 2003- | | |
| 3737 |  | United Kingdom Wrestling Alliance | Sheffield, England, UK | 2002-2004 | | |
| 3738 |  | United Nations Wrestling | Tokyo, Japan | 1995-2003 | | |
| 3739 |  | United Pro Wrestling | Brisbane, Queensland, Australia | 2013- | | |
| 3740 |  | United Pro Wrestling | Bowling Green, Kentucky, USA | 2017-2021 | | |
| 3741 |  | United Pro Wrestling | Aberdeenshire, Scotland, UK | 2017- | | |
| 3742 |  | United Pro Wrestling | Raleigh, North Carolina, USA | 2023- | | |
| 3743 |  | United Pro Wrestling Association | Wilmington, North Carolina, USA | 2005- | | |
| 3744 |  | United States Championship Wrestling | Florida, USA | 2004- | | |
| 3745 | | United States Championship Wrestling | Pennsylvania, USA | 1994-1999 | | |
| 3746 | | United States Wrestling | Pasadena, Maryland, USA | 2010- | | |
| 3747 |  | United States Wrestling Alliance | Jacksonville, Florida, USA | 2011- | | |
| 3748 |  | United States Wrestling Federation | New York, USA | 1995-1996 | | |
| 3749 | | United States Wrestling Federation | Westerly, Rhode Island, USA | 2024- | | |
| 3750 |  | United States Wrestling League | Butler, Pennsylvania, USA | 1993-1999 | | |
| 3751 |  | United States Wrestling Organization | Nashville, Tennessee, USA | 2001- | | |
| 3752 | | United World Wrestling Alliance | Mercerville, New Jersey, USA | 1996-2001 | | |
| 3753 | | United Wrestling Alliance | Texas, USA | 1993-2007 | | |
| 3754 |  | United Wrestling Coalition | Wrightstown, New Jersey, USA | 1998- | | |
| 3755 |  | United Wrestling Entertainment | Tahlequah, Oklahoma, USA | 2009- | | |
| 3756 |  | United Wrestling Federation | South Carolina, USA | 2006-2008 | | |
| 3757 |  | United Wrestling Federation | Georgetown, Kentucky, USA | 2011-2015 | | |
| 3758 | | United Wrestling Federation | New Jersey, USA | 2000-2009 | | |
| 3759 |  | United Wrestling Federation | Massachusetts, USA | 2001-2003 | | |
| 3760 |  | United Wrestling Federation Australia | Bankstown, New South Wales, Australia | 2002-2008 | | |
| 3761 |  | United Wrestling Live | Stoke on Trent, Staffordshire, England, UK | 2011- | | |
| 3762 |  | United Wrestling Network | California, USA | 2013- | | |
| 3763 |  | United Wrestling UK | Oxford, Oxfordshire, England, UK | 2018- | | |
| 3764 |  | United210 | San Antonio, Texas, USA | 2023- | | |
| 3765 |  | Unity Pro Wrestling | California, USA | 2015 | | |
| 3766 |  | Universal Championship Wrestling | Hartford, Kentucky, USA | 2005-2023 | | |
| 3767 |  | Universal Championship Wrestling | Atlanta, Georgia, USA | 2003- | | |
| 3768 | | Universal Championship Wrestling | Lorain, Ohio, USA | 1997-2001 | | |
| 3769 |  | Universal Fighting-Arts Organization | Japan | 1998-2002 | | |
| 3770 |  | Universal Independent Wrestling | Villa Rica, Georgia, USA | 2009-2018 | | |
| 3771 |  | Universal Lucha Company | Coyoacan, Distrito Federal, Mexiko | 2022- | | |
| 3772 | | Universal Superstars Of America | New York, USA | 1992-1997 | | |
| 3773 | | Universal Wrestling | Ohio, USA | 1974-1975 | | |
| 3774 |  | Universal Wrestling Alliance | Aurora, Illinois, USA | 1998-2001 | | |
| 3775 |  | Universal Wrestling Association | Naucalpan de Juarez, Estado de Mexico, Mexiko | 1975-1995 | | |
| 3776 | | Universal Wrestling Association | Alabama, USA | 1996 | | |
| 3777 |  | Universal Wrestling Entertainment | Tlalnepantla, Estado de Mexico, Mexiko | 2008- | | |
| 3778 | | Universal Wrestling Federation | Helmstedt, Niedersachsen, Deutschland | 2000-2001 | | |
| 3779 |  | Universal Wrestling Federation | Tokyo, Japan | 1984-1985 | | |
| 3780 | | Universal Wrestling Federation 2006 | Ardmore, Oklahoma, USA | 2006-2012 | | |
| 3781 |  | Universal Wrestling Superstars | New York, New York, USA | 1989-1994 | | |
| 3782 |  | Unsanctioned Pro | Columbus, Ohio, USA | 2018- | | |
| 3783 |  | Unstoppable British Wrestling | Barnsley, South Yorkshire, England, UK | 2019- | | |
| 3784 |  | Unstoppable Wrestling | Rawtenstall, Lancashire, England, UK | 2019- | | |
| 3785 |  | Upbrawl Championship Wrestling | Sunderland, Tyne And Wear, England, UK | 2015-2022 | | |
| 3786 |  | Upper Limit Wrestling | New Jersey, USA | 2021- | | |
| 3787 |  | Uprising Women Athletes | LaSalle, Illinois, USA | 2024- | | |
| 3788 |  | Uproar Pro Wrestling | New Port Richey, Florida, USA | 2013-2016 | | |
| 3789 |  | Upstart Pro Wrestling | Indianapolis, Indiana, USA | 2019- | | |
| 3790 |  | Upstate Pro Wrestling | Rochester, New York, USA | 2003- | | |
| 3791 |  | Urban Empire Wrestling | Philadelphia, Pennsylvania, USA | 2003-2006 | | |
| 3792 |  | Urban Wrestling Alliance | South Shields, Tyne And Wear, England, UK | 2006-2010 | | |
| 3793 |  | Urban Wrestling Federation | New York City, New York, USA | 2011-2012 | | |
| 3794 |  | VALOR Wrestling | Kopenhagen, Dänemark | 2016- | | |
| 3795 |  | VAMOSTAR Pro Wrestling | Tokyo, Japan | 2020- | | |
| 3796 |  | VCW Pro Wrestling | Wales, UK | 2020- | | |
| 3797 |  | VII Underground | Shrewsbury, Shropshire, England, UK | 2015-2016 | | |
| 3798 |  | VIP Wrestling | Dallas, Texas, USA | 2014- | | |
| 3799 |  | VKF Pro Wrestling | Osaka, Japan | 2007- | | |
| 3800 |  | VPR Producciones | Ecatepec, Estado de Mexico, Mexiko | 2020- | | |
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