| Napoli Basket Vomero | — | Nápoles | 1986 | — |
| NBA New Basket A-Zena | — | Génova | — | — |
| New Basket Palestrina | — | — | — | — |
| New Orleans Pelicans | National Basketball Association | Nueva Orleans | 2002 | Paycom Center, Smoothie King Center |
| New Polibasket San Bonifacio | — | — | — | — |
| New York Knicks | National Basketball Association | Nueva York | 1946 | Madison Square Garden, Madison Square Garden (1925), 69th Regiment Armory |
| NPC Rieti | — | Rieti | 2011 | — |
| Nuova Sebastiani Basket Rieti | — | Rieti | 1946 | — |
| OBG Roma | — | — | — | — |
| Oklahoma City Thunder | National Basketball Association | Oklahoma City | 2008 | Climate Pledge Arena, Tacoma Dome, Paycom Center, Kingdome |
| Oleggio Magic Basket | — | Oleggio | — | — |
| Olimpia Basket Matera | — | Matera | 1960 | — |
| Olimpia Milano | Lega Basket Serie A | Milán | 1936 | Forum di Milano |
| Olympia 68 Basketball | — | Regio de Calabria | — | — |
| Oratorio Elmas | — | — | — | — |
| Orlando Magic | National Basketball Association | Orlando | 1989 | Amway Arena, Kia Center |
| Pallacanestro Aurora Desio | — | Desio | 1994 | — |
| Pallacanestro Biella | — | Biella | 1994 | BiellaForum |
| Pallacanestro Broni 93 | — | — | — | — |
| Pallacanestro Cantù | Lega Basket Serie A | Cermenate | 1936 | Palasport Pianella |
| Pallacanestro Don Bosco Livorno | — | — | — | — |
| Pallacanestro Femminile Costone | — | — | — | — |
| Pallacanestro Gallaratese | — | — | — | — |
| Pallacanestro Interclub | — | — | — | — |
| Pallacanestro Lago Maggiore | — | — | — | — |
| Pallacanestro Lucca | — | Lucca | — | — |
| Pallacanestro Marsala | — | — | — | — |
| Pallacanestro Messina | — | Mesina | 1976 | — |
| Pallacanestro Milano 1958 | — | Milán | 1957 | — |
| Pallacanestro Olimpia La Spezia | — | La Spezia | 1969 | — |
| Pallacanestro Piacentina | — | Piacenza | 2011 | — |
| Pallacanestro Reggiana | Lega Basket Serie A | Reggio Emilia | 1974 | PalaBigi |
| Pallacanestro Sanga Milano | — | Milán | — | — |
| Pallacanestro Sant'Antimo | — | Sant'Antimo | 1989 | — |
| Pallacanestro Senigallia | — | Senigallia | — | — |
| Pallacanestro Trieste | Lega Basket Serie A | Trieste | 1975 | Palatrieste |
| Pallacanestro Virtus Cassino | — | Frosinone | 2011 | — |
| Pallalcesto Amatori Udine | inactivo | Údine | 1944 | Palasport Primo Carnera |
| Palmares Catania | — | Catania | — | — |
| Pantere Basket Femminile | — | — | — | — |
| PB63 Lady | — | — | 1963 | — |
| Pescara Basket | Serie C (Italian men's basketball league) | Pescara | — | PalaElettra |
| PF Schio | — | Schio | 1973 | — |
| PF Umbertide | — | Umbertide | 2008 | — |
| Phoenix Suns | National Basketball Association | Phoenix | 1968 | Arizona Veterans Memorial Coliseum, Footprint Center |
| Pistoia Basket 2000 | Lega Basket Serie A | Pistoya | 2000 | PalaFermi |
| Polisportiva Cervia Milano Marittima | — | — | — | — |
| Polisportiva Dinamo | — | — | — | — |