| Utah Mountain Biking | Bike Shop |  | UT | Lehi | 8 |
| U.C. Caprivesi | Race Team | | | Gorizia | 1 |
| U.S. National Whitewater Center | Trail Association | | NC | Charlotte | 0 |
| Ubac | Bike Shop | | QC | Bromont | 5 |
| Uberbike | Bike Shop | | | Sheffield | 4 |
| Uc Cyclery | Bike Shop | | CA | | 3 |
| Ucluelet Mountain Bike Association | Trail Association | | BC | Ucluelet | 1 |
| UCSB Cycling Team | Club | | CA | | 17 |
| Uganda Enduro | Trail Association | | | Kampala | 0 |
| Uinta Bicycles | Bike Shop | | UT | Kamas | 0 |
| UK Gravity Enduro | Race/Event Organizer | | | marton | 0 |
| UK MTB Squad | Club | | | Wrexham | 8 |
| UK MTB Trail Alliance | Trail Association | | | | 0 |
| Ukbike Store | Bike Shop | | | Gosport | 18 |
| Ukee Bikes | Bike Shop | | BC | Ucluelet | 2 |
| Ukiah Valley Trail Group | Trail Association | | CA | Ukiah | 5 |
| Ulricehamns cykelklubb | Club | | | Ulricehamn | 0 |
| Ulstein og Omegn Sykkelklubb | Club | | | Ulsteinvik | 0 |
| Ultimate Bicycle - Matthews | Bike Shop | | NC | Charlotte | 5 |
| Ultimate Bicycle - Pineville | Bike Shop | | NC | Pineville | 0 |
| Ultimate Cycles Nowra | Bike Shop | | | Nowra | 2 |
| Ultimate Nordic | Other | | | Oslo | 0 |
| Ultimate Rentals and Bike Shop | Bike Shop | | PA | Grove City | 1 |
| Ultimate Sports | Bike Shop | | CO | Trinidad | 1 |
| Ultime Vélo | Bike Shop | | QC | Sainte-Julie | 6 |
| UltimeBike | Bike Shop | | | Avignon | 2 |
| Ultra Violet Alma | Bike Shop | | QC | Alma | 1 |
| Ultra Violet Chicoutimi | Bike Shop | | QC | Chicoutimi | 1 |
| Ultraviolet | Bike Shop | | QC | Jonquière | 4 |
| Ulu Conservancy | Other | | | | 1 |
| Um mais um bike upgrades e oficina | Bike Shop | | | Nova Iguaçu | 4 |
| UMass Cycling Club | Club | | MA | Amherst | 1 |
| Umbria in Bike | Other | | | Foligno | 0 |
| Umeå Downhill | Trail Association | | | Umeå | 5 |
| Unaas Cycling | Bike Shop | | | Oslo | 0 |
| Under the Mount | Accommodation | | | Melrose | 1 |
| União Blumenauense de Ciclismo | Trail Association | | | Blumenau | 4 |
| Union Cycle | Bike Shop | | MA | Attleboro | 2 |
| Union Cycliste Ambert Auvergne | Race/Event Organizer | | | Ambert | 1 |
| Union Cycliste Grimaudoise | Club | | | | 1 |
| Union Cycliste Internationale | Race/Event Organizer | | | Aigle | 0 |
| Union Street Cycle | Bike Shop | | BC | Vancouver | 1 |
| Unione Sportiva Derviese | Club | | | Dervio | 1 |
| Unit 23 | Bike Shop | | | Dumbarton | 74 |
| United Cycle | Bike Shop | | AB | | 98 |
| United Cycling | Bike Shop | | PA | Johnstown | 0 |
| United Cyclists Cycling Club | Club | | | | 1 |
| United Federation of Dirt | Race/Event Organizer | | MO | | 0 |
| United Mountain Bikers of Washington | Club | | WA | Lynnwood | 6 |
| United Riders Of Crowsnest | Trail Association | | AB | | 26 |
| United Riders of Cumberland | Trail Association | | BC | Cumberland | 53 |
| United Strangers | Other | | BC | North Vancouver | 4 |
| UNITED Team Arezzo | Race Team | | | Arezzo | 0 |
| UniTrek | Bike Shop | | | Poprad | 0 |
| Universal Cycles | Bike Shop | | OR | Portland | 22 |
| Universal Cycles | Bike Shop | | CA | Studio City | 3 |
| Universal Cycles Lancaster | Bike Shop | | PA | | 0 |
| Universal Sports | Bike Shop | | SK | Humboldt | 2 |
| University Bicycle Center, Inc | Bike Shop | | FL | Tampa | 3 |
| University Bicycles | Bike Shop | | CO | Boulder | 12 |
| University Cycle | Bike Shop | | MN | Mankato | 0 |
| University of Alabama Outdoor Recreation Bike Shop | Bike Shop | | AL | Tuscaloosa | 1 |
| University of Brighton Cycle Club | Race Team | | | Brighton | 0 |
| University Of Kent Cycling Club | Race Team | | | Canterbury | 4 |
| University of Rio Grande - Gateway Trail System | Trail Association | | OH | Rio Grande | 0 |
| University of Wyoming Mountain Bike Club | Race Team | | WY | Laramie | 2 |
| Unspoken Bike Shop | Bike Shop | | NH | Bethlehem | 0 |
| Unsworth Bike Club | Trail Association | | | Cambridge | 2 |
| Untamed Race Team | Race Team | | BC | | 0 |
| Up and Running | Bike Shop | | TX | El Paso | 0 |
| Up Down Trails | Shuttle Service | | | | 0 |
| Upcycle Bikes | Bike Shop | | | Saarbrücken | 1 |
| Upcycled Adventures | Other | | CA | Truckee | 0 |
| Upington Crusaders | Club | | | Upington | 0 |
| Upper Cumberland SORBA | Trail Association | | TN | Cookeville | 6 |
| Upper Hudson Trails Alliance | Trail Association | | NY | Johnsburg | 0 |
| Upper Mountain Bikes | Bike Shop | | | Blackheath | 0 |
| Upper Valley Land Trust | Trail Association | | NH | Hanover | 0 |
| Upper Valley Mountain Bike Association | Trail Association | | NH | Lebanon | 6 |
| Upper Valley Trails Alliance | Trail Association | | NH | Lyme | 0 |
| UpperTrails | Trail Association | | | Linz | 9 |
| Uppsala Stigcyklister | Trail Association | | | Uppsala | 7 |
| Upshift Cycles | Bike Shop | | CA | San Jose | 0 |
| Upshur County Trails Volunteer Group | Trail Association | | WV | Buckhannon | 0 |
| Upstate Greenways and Trails Alliance | Trail Association | | SC | Greenville | 2 |
| Upstate SORBA | Trail Association | | SC | Greenville | 8 |
| Urban bike | Bike Shop | | QC | Montreal | 1 |
| Urban Cycles | Bike Shop | | | Bristol | 6 |
| Urban Downfall Cycles | Bike Shop | | UT | Orem | 33 |
| Urban Singletrack Project | Trail Association | | CO | Colorado Springs | 2 |
| Urban Trail Co. | Trail Association | | MO | Kansas City, MO | 12 |
| Urban Tri Gear | Bike Shop | | IL | Westmont | 0 |
| urban wheels | Bike Shop | | | Rhondda | 2 |
| urban wheels skate store | Bike Shop | | | | 0 |
| Urbanair | Bike Shop | | | Derbyshire | 19 |
| Urbane Cyclist Worker Co-op | Bike Shop | | ON | Toronto | 12 |
| Urbanistic Tea & Bike Shop | Bike Shop | | CO | Denver | 0 |
| Urbikers | Trail Association | | | Altdorf UR | 2 |
| Urørt ski- og sykkeleventyr | Guides & Tours | | | | 0 |
| US Army Corps Of Engineers - HQ | Land Managers | | DC | Washington DC | 1 |
| US Army Corps Of Engineers - Louisville District | Land Managers | | KY | Louisville | 0 |
| US Forest Service | Land Managers | | DC | Washington DC | 0 |
| US Virgin Islands Trail Alliance | Trail Association | | VI | Christiansted | 0 |
| USA Bikes | Bike Shop | | | Cholula | 11 |
| USACE - Philadelphia District | Other | | PA | | 0 |
| USFS - Cibola National Forest & Mt Taylor... | Land Managers | | NM | Grants | 0 |
| USFS - Dillon Ranger District | Other | | CO | | 0 |
| USFS - Safford Ranger District | Trail Association | | AZ | Safford | 0 |
| USFS - Truckee Ranger District | Land Managers | | CA | Truckee | 0 |
| USFS - White Mountain National Forest | Land Managers | | NH | Campton | 0 |
| USSY FREERIDE | Trail Association | | | Fontainebleau | 0 |
| Ustria Pensiun Restaurant mit Bed & Breakfast | Accommodation | | | Lumnezia | 0 |
| Utah Mountain Biking Adventures | Guides & Tours | | UT | St. George | 0 |
| Utah Rocky Mountain Bikers | Trail Association | | UT | Orem | 1 |
| Utah Valley Trails Alliance | Trail Association | | UT | Orem | 5 |
| Ute City Cycles | Bike Shop | | CO | | 5 |
| Útisport Akureyri | Bike Shop | | | Akureyri | 0 |
| UW Bike Centre | Bike Shop | | ON | Waterloo | 1 |
| UWSA Bike Lab | Bike Shop | | MB | Winnipeg | 1 |