| Aurich–Cañaña | — | — | 1993 | Estadio Elías Aguirre |
| Aurora Basket Jesi | — | Jesi | 1966 | PalaTriccoli |
| Austin FC | Major League Soccer | Austin | 2018 | Q2 Stadium |
| Auxilium Pallacanestro Torino | — | Turín | 1974 | Palazzetto dello Sport Gianni Asti |
| Ayacucho Fútbol Club | Primera División del Perú | — | 1972 | Estadio Las Américas |
| Azzurro Napoli Basket 2013 | — | Nápoles | 2013 | PalaBarbuto |
| Baltimore Bullets | National Basketball Association | Baltimore | 1944 | Baltimore Coliseum |
| Baltimore Colts | — | Baltimore | 1947 | — |
| Baltimore Orioles | Grandes Ligas de Béisbol | — | 1894 | Sportsman's Park, Oriole Park at Camden Yards, Lloyd Street Grounds, Memorial Stadium |
| Baltimore Ravens | National Football League | Baltimore | 1996 | Memorial Stadium, M&T Bank Stadium |
| Barcelona de Surquillo | Copa Perú | — | 8 de septiembre de 1975 | Antiguo Estadio Nacional del Perú |
| Basket Alcamo | — | Alcamo | — | — |
| Basket Anagni | — | — | — | — |
| Basket Barcellona | — | Barcellona Pozzo di Gotto | 1976 | — |
| Basket Bees Treviglio | — | — | — | — |
| Basket Biassono | — | Biassono | — | — |
| Basket Brescia | — | Brescia | 1957 | — |
| Basket Carugate | — | Carugate | — | — |
| Basket Casier | — | Casier | — | — |
| Basket Club Bolzano | — | Bolzano | — | Palazzetto dello sport "Paola Mazzali" |
| Basket Club Valtarese 2000 | — | — | — | — |
| Basket Costa | — | — | — | — |
| Basket Costa Catania | — | Catania | — | — |
| Basket Draghi Novara | — | Novara | 1972 | — |
| Basket Femminile Livorno | — | Livorno | — | — |
| Basket Femminile Pavia | — | — | — | — |
| Basket Ferentino | — | Ferentino | 1977 | — |
| Basket Fossombrone | — | Fossombrone | — | — |
| Basket Foxes Giussano | — | Giussano | 1983 | — |
| Basket Livorno | — | Livorno | 1947 | — |
| Basket Massafra | — | Massafra | — | — |
| Basket Montichiari | — | — | — | — |
| Basket Ravenna | — | Ravena | 1984 | — |
| Basket Rimini | — | — | — | — |
| Basket Rimini Crabs | Serie A2 | Rímini | 1947 | Palasport Flaminio |
| Basket San Salvatore Selargius | — | Selargius | — | — |
| Basket Team Crema | — | — | — | — |
| Basket Torino | — | Turín | 2019 | Palazzetto dello Sport Gianni Asti |
| Basketball Valdarno | — | — | — | — |
| Basketball Vigarano | — | Vigarano Mainarda | — | — |
| BC Castelnuovo Scrivia | — | Castelnuovo Scrivia | 1986 | — |
| BC Roma SPQR | Lega Basket Serie A | — | 2026 | Palazzetto dello Sport |
| BCC Agropoli | — | Agropoli | 1966 | — |
| Bears Mestre | — | Mestre | — | — |
| Benedetto XIV Cento | — | San Lazzaro di Savena | 2011 | — |
| Bergamo Basket 2014 | — | Bérgamo | 1970 | — |
| Blu Basket 1971 | — | Treviglio | 1971 | — |
| Boston Braves | — | — | 1871 | — |