| Green Bay Packers | National Football League | — | 1919 | Lambeau Field |
| Grifone Catania | — | Catania | — | — |
| Gruppo Sportivo Bernocchi | Serie A1 | Legnano | 1945 | — |
| Gruppo Universitario Fascista Agrigento | — | Agrigento | — | — |
| GSD Porto Torres | — | Porto Torres | 1996 | — |
| Guerino Vanoli Basket | Lega Basket Serie A | Cremona | 1999 | Palasport Mario Radi |
| Hamilton Tigers | — | — | 1920 | Barton Street Arena |
| Handicap Sport Varese | — | — | — | — |
| Hartford Whalers | — | — | 1972 | Matthews Arena |
| Hatria Basket | — | — | — | — |
| Houston Dynamo | Major League Soccer | Houston | 2005 | Shell Energy Stadium |
| Houston Rockets | National Basketball Association | Houston | 1967 | Toyota Center, Lakewood Church Central Campus, Hofheinz Pavilion, San Diego Sports Arena |
| Huancayo Sporting Club | Copa Perú | — | — | Estadio Huancayo |
| Inclán Sport Club | Copa Perú | — | — | — |
| Indiana Pacers | National Basketball Association | Indianápolis | 1967 | Gainbridge Fieldhouse, Corteva Coliseum, Market Square Arena |
| Indianapolis Colts | National Football League | Indianápolis | 1953 | Memorial Stadium, Lucas Oil Stadium, RCA Dome |
| Indianapolis Olympians | National Basketball Association | Indianápolis | 1949 | Hinkle Fieldhouse |
| Institución Deportiva Colegio Nacional de Iquitos | Copa Perú | — | 1926 | Estadio Max Augustín |
| Inter de Miami | Major League Soccer | Miami | 29 de enero de 2018 | Chase Stadium |
| International Marine Incorporated Fútbol Club | Copa Perú | — | 1992 | Estadio Campeonísimo |
| Ivrea Basket Team | — | Ivrea | — | — |
| Jacksonville Jaguars | National Football League | — | 1995 | TIAA Bank Field |
| JesoloSandonà Basket | — | Jesolo | — | — |
| Jorge Chávez | — | — | — | Estadio Telmo Carbajo |
| José Carlos Mariategui | Copa Perú | — | 16 de julio de 1975 | Antiguo Estadio Nacional del Perú |
| José Gálvez | Primera División del Perú | — | 1951 | Estadio Manuel Rivera Sánchez |
| Juan Aurich | — | — | 1922 | Estadio Elías Aguirre |
| Juan Aurich | — | — | 1996 | Estadio Elías Aguirre |
| Juvecaserta Basket | Lega Basket Serie A, Serie B | Castel Morrone | 1951 | PalaMaggiò |
| Juvenil Andino | Copa Perú | — | 11 de agosto de 1932 | — |
| Juvenil Los Ángeles | Copa Perú | — | 1958 | — |
| Juvenilia Reggio Emilia | — | Reggio Emilia | — | — |
| Juventud La Rural | Copa Perú | — | 1946 | — |
| Juventud Progreso | Copa Perú | — | — | — |
| Juventud Ticlacayán | Copa Perú | — | 2011 | Estadio Daniel Alcides Carrión |
| Juventus Basket Pontedera | — | — | — | — |
| Juventus Corazón | Copa Perú | — | — | — |
| Juvi Cremona Basket | — | — | — | — |
| Kansas City Chiefs | National Football League | Kansas City, Dallas | 1960 | Estadio Cotton Bowl, Municipal Stadium, Arrowhead Stadium |
| KDT Nacional Sporting Club | Copa Perú | — | 1931 | Estadio Telmo Carbajo |
| La Peña Sporting Club | Copa Perú | — | 6 de abril de 1968 | — |
| Las Vegas Raiders | National Football League | Las Vegas | 1960 | Los Angeles Memorial Coliseum, Oakland Coliseum, Allegiant Stadium |
| Lawn Tennis de la Exposición (fútbol) | Copa Perú | — | 27 de junio de 1884 | Estadio Nacional del Perú |
| Lawn Tennis Fútbol Club | Copa Perú | — | 1995 | Estadio Nacional del Perú |
| Legnano Knights | — | Legnano | 1966 | — |
| León de Huánuco | Segunda División del Perú | — | 1946 | Estadio Heraclio Tapia |
| Libertas Basket Bologna | — | Bolonia | — | — |
| Libertas Livorno | — | Livorno | 1 de noviembre de 1947 | — |