| Atlanta United FC | Major League Soccer | Atlanta | 2014 | Mercedes-Benz Stadium, Bobby Dodd Stadium |
| Atlético Barrio Frigorífico | Copa Perú | — | — | — |
| Atlético Belén de Moyobamba | Copa Perú | — | April 20, 1960 | Estadio IPD de Moyobamba |
| Atlético Chalaco | Copa Perú | — | 1902 | Estadio Telmo Carbajo |
| Atlético Deportivo Olímpico | Copa Perú | — | — | Estadio Telmo Carbajo |
| Atlético Grau | Peruvian Primera División | — | 1919 | Estadio Miguel Grau |
| Atlético Huracán de Moquegua | Copa Perú | — | July 26, 1958 | — |
| Atlético Lusitania | Copa Perú | — | October 18, 1922 | National Stadium of Peru |
| Atlético Minero | Peruvian Segunda División | — | 1997 | Estadio Municipal de Matucana |
| Atlético Mollendo | Copa Perú | — | — | — |
| Atlético Telmo Carbajo | Copa Perú | — | November 16, 1928 | Estadio Telmo Carbajo |
| Atlético Universidad | Copa Perú | — | February 24, 1964 | Arequipa Stadium |
| Aurich–Cañaña | — | — | 1993 | Estadio Elías Aguirre |
| Aurora Basket Jesi | — | Jesi | 1966 | PalaTriccoli |
| Aurora Chancayllo | Copa Perú | — | August 10, 1931 | Estadio Rómulo Shaw Cisneros |
| Aurora Miraflores | Copa Perú | — | January 2, 1958 | Manuel Bonilla Sports Complex |
| Austin FC | Major League Soccer | Austin | 2018 | Q2 Stadium |
| Auxilium Pallacanestro Torino | — | Turin | 1974 | Palazzetto dello Sport Gianni Asti |
| Ayacucho FC | Peruvian Primera División | — | 1972 | Estadio Las Américas |
| Azzurra Brindisi | — | Brindisi | 1964 | — |
| Baltimore Bullets | National Basketball Association | Baltimore | 1944 | Baltimore Coliseum |
| Baltimore Colts | — | Baltimore | 1947 | — |
| Baltimore Orioles | Major League Baseball | — | 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 | — | September 8, 1975 | Estadio Nacional del Perú (1897) |
| Basket Agropoli | — | Agropoli | 1966 | — |
| Basket Alcamo | — | Alcamo | — | — |
| Basket Anagni | — | — | — | — |
| Basket Brescia | — | Brescia | 1957 | — |
| Basket Brescia Leonessa | Serie A | Brescia | 2009 | PalaLeonessa |
| Basket Casier | — | Casier | — | — |
| Basket Cavezzo | — | Cavezzo | 1978 | — |
| Basket Cefalù | — | — | — | — |
| Basket Club Bolzano | — | Bolzano | — | Palazzetto dello sport "Paola Mazzali" |
| Basket Club Valtarese 2000 | — | — | — | — |
| Basket Costa Catania | — | Catania | — | — |
| Basket Draghi Novara | — | Novara | 1972 | — |
| Basket Femminile Livorno | — | Livorno | — | — |
| Basket Femminile Pavia | — | — | — | — |
| Basket Ferentino | — | Ferentino | 1977 | — |
| Basket Fossombrone | — | Fossombrone | — | — |
| Basket Livorno | — | Livorno | 1947 | — |
| Basket Lumezzane | — | Lumezzane | — | — |
| Basket Massafra | — | Massafra | — | — |
| Basket Mestre 1958 | — | Mestre | 1958 | Vitrifrigo Arena |
| Basket Montichiari | — | — | — | — |
| Basket Palestrina 1962 | — | — | — | — |
| Basket Ravenna Piero Manetti | — | Ravenna | 1984 | — |