 | UAS (Zhytkavichy ), Belarus |
 | Uberaba (Uberaba), Brazil |
| Uberlândia (Uberlândia), Brazil |
| Ubiratan (Dourados), Brazil |
 | Uccle Sport (Uccle), Belgium |
 | UCD (Dublin), Ireland |
 | Uckfield (Uckfield), England |
 | UCSA (Tarasivka), Ukraine |
 | Uddevalla (Uddevalla), Sweden |
 | UDIB (Bissau), Guinea-Bissau |
 | Udinese (Udine), Italy |
 | Udoji United (Awka), Nigeria |
 | UE Santa Coloma (Santa Coloma), Andorra |
 | Uerdingen 05 (Uerdingen), Germany |
 | Uerdingen 05 II (Krefeld), FRG |
 | Ufimets (Ufa), USSR |
 | Uganda Electricity Board, Uganda |
| UGB Sports (London), England |
| UGB St Helens, England |
| Ugolshchik (Shakhtinsk), USSR |
 | Ugyen Academy (Punakha), Bhutan |
 | Uherské Hradiště (Uherské Hradiště), Czech Republic |
 | Újpest (Budapest), Hungary |
| Újpest-Rákospalotai (Budapest), Hungary |
| Újpesti MTE (Budapest), Hungary |
| Újpesti Törekvés (Budapest), Hungary |
| Ujvidek (Ujvidek), Hungary |
| UkrAhroKom (Holovkivka), Ukraine |
 | Ulaanbaatar (Ulaanbaatar), Mongolia |
 | ULIM (Chişinău), Moldova |
 | Ulinzi Stars (Nakuru), Kenya |
 | Ulisses (Yerevan), Armenia |
 | Ullensaker/Kisa (Jessheim), Norway |
| Ulm 1846 (Ulm), FRG |
| Ulm 1846 (Ulm), Germany |
 | Ulsan Hyundai (Ulsan), South Korea |
| Ulster, England |
| Ulverston Town, England |
 | Ulytau (Jezkazgan), Kazakhstan |
| Umeå (Umeå), Sweden |
 | Umed (Dushanbe), Tajikistan |
 | Ümid (Baku), Azerbaijan |
| Ümid (Dzhalilabad), Azerbaijan |
| Umid (Tashkent), USSR |
 | Umm Salal (Umm Salal), Qatar |
 | UMS de Loum (Loum), Cameroon |
 | Umtata Bush Bucks (East London), South Africa |
| Umud (Dzhalilabad), USSR |
 | UNAM (México), Mexico |
 | UNB (Cotonou), Benin |
 | UNDEBA (Soto), Netherlands Antilles |
| Underdog (Chysts), Belarus |
 | Unia (Racibórz), Poland |
| União (Rondonópolis), Brazil |
| União Bandeirante (Bandeirantes), Brazil |
| União Barbarense (Santa Bárbara d'Oeste), Brazil |
 | União da Madeira (Madeira), Portugal |
| União de Coimbra (Coimbra), Portugal |
| União de Leiria (Leiria), Portugal |
| União de Lisboa (Lisboa), Portugal |
| União de Tomar (Tomar), Portugal |
 | Uniao Flamengo Santos Football (Gaborone), Botswana |
| União Recreativa dos Trabalhadores (Patos de Minas), Brazil |
| União São João (Araras), Brazil |
| Unidos (Lisboa), Portugal |
 | Union (Berlin), GDR |
| Union (Berlin), Germany |
| Union (Cheb), Czech Republic |
 | Unión (General Pinedo), Argentina |
 | Unión (Huaral), Peru |
| Union (Krefeld), FRG |
 | Union (Luxembourg), Luxembourg |
| Union (Neumünster), FRG |
| Union (Salzgitter), FRG |
 | Unión (San Felipe), Chile |
| Unión (Santa Fe), Argentina |
| Union (Solingen), FRG |
 | Union (Wels), Austria |
| Union 06 (Berlin), FRG |
 | Unión Atlético (Maracaibo), Venezuela |
| Union Böckingen (Heilbronn), FRG |
 | Union Cheb (Cheb), Czechoslovakia |
| Unión Comercio (San Martín), Peru |
| Union d'Ixelles (Brussels), Belgium |
| Union Douala (Douala), Cameroon |
| Unión Española (Santiago), Chile |
| Union Essen-Frintrop (Эссен), FRG |
| Union Jack (Bristol), England |
| Unión La Calera, Chile |
| Unión Lara (Barquisimeto), Venezuela |
 | Unión Magdalena (Santa Marta), Colombia |
| Union Saint-Gilloise (Brussels), Belgium |
| Unión San Vicente (Córdoba), Argentina |
 | Union Sidi Kacem (Sidi Kacem), Morocco |
 | Union Sport, Congo |
 | Union Sportive (Beau Bassin-Rose Hill), Mauritius |
 | Union Sportive Centrafricaine (Bangui), Central African Republic |
| Unión Talleres-Lanús (Remedios de Escalada), Argentina |
| Union Titus Pétange (Pétange), Luxembourg |
 | Union Vesper (Bata), Equatorial Guinea |
| Union-Touring (Łódź), Poland |
 | Unique (Saint Thomas), US Virgin Islands |
 | Unirea (Urziceni), Romania |
| Unisport Bafang (Bafang), Cameroon |
 | Unisport de Sokodé (Sokodé), Togo |
| Unisport-Auto (Chişinău), Moldova |
 | Unitech, Papua New Guinea |
 | United City (Bacolod), Philippines |
| United Hospital, England |
| United London Swifts, England |
| United of Manchester (Bury), England |
 | United Petrotrin (Palo Seco), Trinidad and Tobago |
| United Services Portsmouth (Portsmouth), England |
 | United Team of DSO (Sofia), Bulgaria |
| Unity, England |
| Universidad (Concepción), Chile |
| Universidad (Guadalajara), Mexico |
 | Universidad (San Miguel), El Salvador |
 | Universidad Católica (Quito), Ecuador |
| Universidad Católica (Santiago), Chile |
 | Universidad Catolica (Santiago de los Caballeros), Dominican Republic |
 | Universidad Centroamericana (Managua), Nicaragua |
| Universidad César Vallejo (Trujillo), Peru |
| Universidad de Chile (Santiago), Chile |
| Universidad de Los Andes (Mérida), Venezuela |
| Universidad O&M (Santo Domingo), Dominican Republic |
| Universidad San Martín (Lima), Peru |
| Universidad Técnica (Cajamarca), Peru |
 | Universitario (La Paz), Bolivia |
| Universitario (Lima), Peru |
 | Universitario (Panama City), Panama |
| Universitario (Sucre), Bolivia |
| Universitario de Vinto (Vinto), Bolivia |
| Universitatea (Cluj), Romania |
| Universitatea (Craiova), Romania |
 | Universitet (Ulyanovsk), Russia |
| University-Inter (Port Moresby), Papua New Guinea |
| Universul (Ciuciuleni), Moldova |
| Unknown, England |
| Unterboihingen (Wendlingen am Neckar), FRG |
| Unterhaching (Unterhaching), FRG |
| Unterhaching (Unterhaching), Germany |
| Upminster, England |
| Upper Armley, England |
| Upsetters (Saint Thomas), US Virgin Islands |
| Upton Colliery, England |
| Upton Park (London), England |
| Upton Rangers, England |
 | Uptown Rebels (Vieux Fort), Saint Lucia |
| URA (Kampala), Uganda |
| Ural (Ekaterinburg), Russia |
| Ural-2 (Ekaterinburg), Russia |
| Uralan (Elista), USSR |
| Uralan-D (Elista), Russia |
| Uralan-Plus (Moscow), Russia |
| Uralelektromed (Verkhnyaya Pyshma), Russia |
| Uralets (Nizhniy Tagil), Russia |
| Uralets (Nizhniy Tagil), USSR |
| Uralets (Uralsk), USSR |
| Uralmash (Sverdlovsk), USSR |
| Uralmash-D (Ekaterinburg), Russia |
| Urania (Hamburg), FRG |
| Urartu (Yerevan), Armenia |
 | Urawa Red Diamonds (Saitama), Japan |
| Urmston, England |
| Urmston Old Boys, England |
| Urozhay (Kanevskaya), USSR |
| Urozhay (Korenovskaya), USSR |
| Urozhay (Krymsk), USSR |
| Urozhay (Labinsk), USSR |
| Urozhay (Leningradskaya), USSR |
| Urozhay (Minsk), USSR |
| Urozhay (Pavlovskaya), USSR |
| Urozhay (Slavyansk-na-Kubani), USSR |
| Urozhay (Svetlograd), USSR |
 | US Bilombe (Bilombe), Zaire |
 | US Bitam (Bitam), Gabon |
| US Cattin, Central African Republic |
 | US Chaouia (Oum-El-Bouaghi), Algeria |
 | US FRAN (Bobo Dioulasso), Upper Volta |
 | US GN (Niamey), Niger |
 | US Gorée (Dakar), Senegal |
 | US Kenya (Lubumbashi), DR Congo |
 | US Marinoise (Le Marin), Martinique |
 | US Ouagadougou (Ouagadougou), Burkina Faso |
| US Ouagadougou (Ouagadougou), Upper Volta |
| US Robert (Le Robert), Martinique |
 | US Stade Tamponnaise (Le Tampon), Réunion |
| US Tshinkunku (Kananga), Zaire |
| USCA (Bangui), Central African Republic |
 | USCA Foot (Antananarivo), Madagascar |
| USFA (Ouagadougou), Burkina Faso |
 | USFAS (Bamako), Mali |
| USFRAN (Bobo Dioulasso), Burkina Faso |
| Ush-Qonyr (Shamalgan), Kazakhstan |
| Ushaw Moor, England |
| Usinger (Usingen), FRG |
| USJF Ravinala (Antananarivo), Madagascar |
 | USL Montjoly (Cayenne), French Guiana |
| USM Aïn Beïda (Aïn Beïda), Algeria |
| USM Alger (Alger), Algeria |
| USM Bel-Abbès (Sidi Bel Abbes), Algeria |
| USM El Harrach (El Harrach), Algeria |
| USM Libreville (Libreville), Gabon |
| USS Kraké (Porto-Novo), Benin |
| Ústí nad Labem (Ústí nad Labem), Czech Republic |
| Usworth Colliery, England |
| UTA (Arad), Romania |
| Utalii, Kenya |
 | Utenis (Utena), Lithuania |
| Utexafrica (Kinshasa), Congo |
 | Utrecht (Utrecht), Netherlands |
| Uttoxeter Town (Uttoxeter), England |
 | Utulei Youth (Pago Pago), American Samoa |
| Uxbridge (London), England |
 | Uz-Dong-Joo (Andijan), Uzbekistan |
| Uzbekistan U23 (Tashkent), Uzbekistan |
