| A.S. Junior Pallacanestro Casale | — | Casale Monferrato | 1956 | — |
| A.S.S.I. Basket 99 Cremona | — | — | — | — |
| Academia Deportiva Cantolao | Copa Perú | — | 2012 | Estadio Miguel Grau |
| AD Comerciantes FC | Peruvian Segunda División | — | — | — |
| Aironi Basket Novara | — | Novara | — | — |
| Alcides Vigo | Copa Perú | — | 1950 | — |
| Alfonso Ugarte de Puno | Copa Perú | — | 1928 | Estadio E. Torres Belón |
| Alfonso Ugarte de Tacna | Copa Perú | — | — | Estadio Jorge Basadre |
| Alianza Cristiana | Peruvian Segunda División | — | April 14, 2008 | Estadio Max Augustín |
| Alianza Frigorífico Nacional | — | — | — | Estadio Nacional del Perú (1897) |
| Alianza Huánuco | Peruvian Segunda División | — | 1939 | Estadio Heraclio Tapia |
| Alianza Unicachi | Copa Perú | — | 2010 | Estadio E. Torres Belón |
| Alipio Ponce de Mazamari | Copa Perú | — | June 21, 1979 | — |
| Alma Basket Patti | — | — | 2012 | — |
| Alpo Basket '99 | — | Alpo | — | — |
| Ambrosiana Milano | — | Milan | — | — |
| AMG Sebastiani Basket Rieti | — | Rieti | 1946 | — |
| Amici Pallacanestro Udinese | — | Udine | 1999 | — |
| Anaheim Ducks | — | — | 1993 | Honda Center |
| Ancona Basket | — | Ancona | — | — |
| Anderson Packers | National Basketball Association | Anderson | 1945 | Anderson High School Wigwam |
| Andrea Costa Imola | Serie A | Imola | October 4, 1967 | — |
| Angels Santarcangelo | — | — | — | — |
| Aquila Basket Trento | Serie A | Trento | 1995 | BTS Arena |
| Aresium Milano | — | Milan | — | — |
| Arizona Cardinals | National Football League | — | 1920 | Comiskey Park, Wrigley Field, Busch Memorial Stadium, Soldier Field, State Farm Stadium, Mountain America Stadium, Metropolitan Stadium, Sportsman's Park |
| Arizona Coyotes | — | Tempe, Glendale, Phoenix | 1972 | Desert Diamond Arena, Mortgage Matchup Center, Mullett Arena |
| Arizona Diamondbacks | Major League Baseball | Phoenix | 1998 | Chase Field |
| AS Vicenza | Lega Basket Femminile | Vicenza | 1958 | — |
| ASD Briantea84 | — | Cantù | 1984 | — |
| ASD Polisportiva Amicacci | — | — | 1984 | — |
| ASDG Comense 1872 | — | Como | 1872 | — |
| Asociación Deportiva Hospital | Copa Perú | — | February 25, 1971 | Estadio Aliardo Soria Pérez |
| Asociación Deportiva San Agustín | Copa Perú | — | August 9, 1970 | National Stadium of Peru |
| Asociación Deportiva Somos Aduanas | Copa Perú | — | 1995 | Estadio Miguel Grau |
| Asociación Deportiva Tarma | Copa Perú | — | June 18, 1929 | Union Tarma Stadium |
| Association Chorrillos | Copa Perú | — | — | Estadio Municipal de Chorrillos |
| Association Football Club | — | — | May 20, 1897 | Estadio Nacional del Perú (1897) |
| Associazione Basket Latina | — | Latina | — | — |
| Associazione Dilettantistica Pallacanestro Recanati | — | Recanati | — | — |
| Associazione Sportiva Luiss | — | — | — | — |
| Athletic Club José Pardo | Copa Perú | — | — | Estadio Max Augustín |
| Athletic Genova | — | Genoa | 1968 | — |
| Athletics | Major League Baseball | — | 1968 | Sutter Health Park |
| Atlanta Braves | Major League Baseball | — | 1871 | Truist Park, Milwaukee County Stadium, Fenway Park, Congress Street Grounds, Braves Field, Turner Field, Atlanta-Fulton County Stadium, South End Grounds I |
| Atlanta Falcons | National Football League | Flowery Branch, Atlanta | 1966 | Georgia Dome, Mercedes-Benz Stadium |
| Atlanta Hawks | National Basketball Association | Atlanta | 1946 | Georgia Dome, State Farm Arena, UW–Milwaukee Panther Arena, St. Louis Arena, Wharton Field House, Kiel Auditorium, McCamish Pavilion, Omni Coliseum |
| 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 | — |