Organizers
- UBarU Camp and Retreat Center
- UBC Geering Up Engineering Outreach
- UBC Okanagan Athletics and Recreation Department
- UCLA Sports Camps
- UCP of Sacramento & Northern California
- UIW Sports and Wellness
- UK Athletics
- UK Athletics - Cheer
- UK Athletics - Dance
- UK Athletics - Rifle
- Ulster University
- Ultra Challenge Ltd
- Ultraman World Championships
- UMaine 4-H Centers
- Umpire Hockey
- Unbeatable Tennis
- Union County Youth League
- Union Mission Ministries Inc
- United Ballers Youth Sports
- United Brachial Plexus Network
- United States Adaptive Golf Alliance
- Universal Soccer & Futsal Academy
- University City Arts League
- University of Florida Dazzlers
- University of Florida Football
- University of Florida Soccer
- University of Florida Softball
- University of Florida Spirit Team Appearances
- University of Florida Women's Basketball
- University of Guelph
- University of Guelph - Connect
- University of Louisiana at Lafayette
- University of Maryland Golf Course
- University of Maryland Gymkana
- University of New Brunswick College of Extended Learning
- UNIVERSITY OF SAN FRANCISCO
- University of Sioux Falls
- University of South Carolina Aiken
- University of Texas Soccer Camp
- University of Toronto, Mathematics Outreach
- University of Toronto, UC Summer Drama for International Students
- Untitled Theatre Productions
- Upper Perkiomen Youth Baseball Association
- Upstate-Carolina Adaptive Golf
- Upturn Arts
- Urbana Park District
- US FreedomWalk Festival
- USA Synchro
- USATimingInc.com
- USD244 Recreation Commission
