| Club | League | Based in | Founded | Home ground |
|---|---|---|---|---|
| Geas Basket | — | Sesto San Giovanni | 1955 | — |
| Giants Basket Marghera | — | Venice | — | — |
| Gioiosa Milano | — | — | — | — |
| Giovanni Russo Cagliari | — | — | — | — |
| Giuseppe Rescifina Messina | — | — | — | — |
| Golden State Warriors | National Basketball Association | San Francisco | 1946 | Philadelphia Arena, SAP Center, Philadelphia Convention Hall and Civic Center, Cow Palace, Oakland Arena, War Memorial Gymnasium, Bill Graham Civic Auditorium, Chase Center |
| Green Bay Packers | National Football League | — | 1919 | Lambeau Field |
| Grifone Catania | — | Catania | — | — |
| Gruppo Sportivo Bernocchi | Lega Basket Femminile | Legnano | 1945 | — |
| Gruppo Universitario Fascista Agrigento | — | Agrigento | — | — |
| Guardia Republicana | Copa Perú | — | 1981 | National Stadium of Peru |