| Los Angeles Clippers | National Basketball Association | Los Angeles | 1970 | Maple Leaf Gardens, Buffalo Memorial Auditorium, Arena Olahraga Memorial Los Angeles, Pechanga Arena, Arena Crypto.com |
| Los Angeles Dodgers | Major League Baseball | Los Angeles | 1884 | Stadion Dodger |
| Los Angeles FC | Liga Utama Sepak Bola Amerika Serikat | Los Angeles | 2014 | Stadion BMO |
| Los Angeles Galaxy | Liga Utama Sepak Bola Amerika Serikat | Los Angeles | 1995 | Taman Olahraga Dignity Health |
| Los Angeles Lakers | National Basketball Association | Los Angeles | 1947 | Forum Kia, Minneapolis Armory, Minneapolis Auditorium, Arena Crypto.com, Arena Olahraga Memorial Los Angeles |
| Los Angeles Rams | Liga Nasional Sepak bola Amerika | — | 1936 | Edward Jones Dome, Angel Stadium of Anaheim, Coliseum Memorial Los Angeles, Stadion SoFi |
| Los Caimanes de Puerto Etén | Peruvian Segunda División | — | 22 Mei 1957 | Estadio Municipal César Flores Marigorda |
| Los Espartanos de Pacasmayo | Copa Perú | — | 1924 | — |
| Los Inseparables Sports and Cultural Club | Copa Perú | — | — | Juan Maldonado Gamarra Stadium |
| Los Tigres de Iquitos | Copa Perú | — | 2005 | Estadio Max Augustín |
| Magika Pallacanestro | — | Castel San Pietro Terme | — | — |
| Magnolia Basket Campobasso | — | Campobasso | 2017 | — |
| Mariscal Miller | Copa Perú | — | — | Estadio Jorge Basadre |
| Mariscal Nieto de Ilo | Copa Perú | — | — | Estadio Mariscal Nieto |
| Mariscal Sucre | — | — | 1925 | Stadion Nasional Peru |
| Maxima Roma | Lega Basket Serie A | — | 2026 | Palazzo dello Sport |
| Memphis Grizzlies | National Basketball Association | Memphis | 1995 | Pyramid Arena, FedExForum |
| Mens Sana Basket | Lega Basket Serie A | Siena | 1861 | Palasport Mens Sana |
| Merchants United Social, Sports and Cultural Association | Peruvian Primera División | — | 19 September 2002 | Juan Maldonado Gamarra Stadium |
| Meyana Mesagne | — | Mesagne | — | — |
| Miami Heat | National Basketball Association | Miami | 1988 | Miami Arena, Kaseya Center |
| Miami Marlins | Major League Baseball | — | 1993 | LoanDepot Park, Hard Rock Stadium |
| Miguel Grau de Abancay | Copa Perú | — | 1955 | Estadio Monumental de Condebamba |
| Milwaukee Braves | Major League Baseball | Milwaukee | 1953 | Milwaukee County Stadium |
| Milwaukee Brewers | Major League Baseball | Milwaukee | 1969 | American Family Field |
| Milwaukee Bucks | National Basketball Association | Milwaukee | 1968 | UW–Milwaukee Panther Arena, Bradley Center, Fiserv Forum |
| Mina San Vicente | Copa Perú | — | Juni 1970 | — |
| Minnesota North Stars | — | Bloomington | 1967 | Met Center |
| Minnesota Twins | Major League Baseball | — | 1901 | Target Field, American League Park, Metropolitan Stadium, Hubert H. Humphrey Metrodome, Boundary Field, Griffith Stadium |
| Minnesota United FC | Liga Utama Sepak Bola Amerika Serikat | Minneapolis | 2015 | Allianz Field, Huntington Bank Stadium |
| Minnesota Vikings | Liga Nasional Sepak bola Amerika | Minnesota | 1961 | Metropolitan Stadium, Huntington Bank Stadium, Hubert H. Humphrey Metrodome, U.S. Bank Stadium |
| Minnesota Wild | — | Saint Paul | 2000 | Grand Casino Arena |
| Miraflores Sporting Club | — | — | — | Estadio Nacional del Perú (1897) |
| Modena Basket | — | — | — | — |
| Montigarda Basket | — | Montichiari | — | — |
| Montreal Expos | Major League Baseball | — | 1969 | Stadion Olimpiade Montreal, Jarry Park Stadium |
| MTVB Herons Basket | — | Montecatini Terme | — | — |
| Napoli Basket | — | Napoli | 1978 | — |
| Napoli Basket | Lega Basket Serie A | Napoli | 2016 | PalaBarbuto |
| Napoli Basket Vomero | — | Napoli | 1986 | — |
| Napoli Basketball | — | Napoli | 2011 | — |
| Nashville Predators | — | — | 1998 | Bridgestone Arena |
| Nashville SC | Liga Utama Sepak Bola Amerika Serikat | Nashville | 2017 | Geodis Park, Nissan Stadium |
| NBA New Basket A-Zena | — | Genova | — | — |
| New Basket Brindisi | Lega Basket Serie A | Brindisi | 1992 | PalaPentassuglia |
| New England Patriots | Liga Nasional Sepak bola Amerika | Foxborough | 1959 | Stadion Gillette |
| New England Revolution | Liga Utama Sepak Bola Amerika Serikat | Foxborough | 1995 | Stadion Gillette |
| New Jersey Devils | — | Newark, East Rutherford | 1974 | Meadowlands Arena, Prudential Center |