| Los Angeles Rams | National Football League | — | 1936 | The Dome at America's Center, Angel Stadium of Anaheim, Los Angeles Memorial Coliseum, SoFi Stadium |
| Los Ángeles Football Club | Major League Soccer | Los Ángeles | 2014 | BMO Stadium |
| Los Ángeles Lakers | National Basketball Association | Los Ángeles | 1947 | The Forum, Minneapolis Armory, Minneapolis Auditorium, Crypto.com Arena, Los Angeles Memorial Sports Arena |
| Magika Pallacanestro | — | Castel San Pietro Terme | — | — |
| Magnolia Basket Campobasso | — | Campobasso | 2017 | — |
| Maurolico Messina | — | — | — | — |
| Maxima Roma | Lega Basket Serie A | — | 2026 | Palazzo dello Sport |
| Memphis Grizzlies | National Basketball Association | Memphis | 1995 | Pyramid Arena, FedExForum |
| Mens Sana Basket Siena | Lega Basket Serie A | Siena | 1861 | Palasport Mens Sana |
| Mercede Basket Alghero | — | Alguer | 1977 | — |
| Miami Dolphins | National Football League | Miami | 1966 | Hard Rock Stadium |
| Miami Heat | National Basketball Association | Miami | 1988 | Miami Arena, Kaseya Center |
| Miami Marlins | Grandes Ligas de Béisbol | — | 1993 | LoanDepot Park, Hard Rock Stadium |
| Milwaukee Braves | Grandes Ligas de Béisbol | Milwaukee | 1953 | Milwaukee County Stadium |
| Milwaukee Brewers | Grandes Ligas de Béisbol | Milwaukee | 1969 | American Family Field |
| Milwaukee Bucks | National Basketball Association | Milwaukee | 1968 | UW-Milwaukee Panther Arena, Bradley Center, Fiserv Forum |
| Minnesota North Stars | — | Bloomington | 1967 | Met Center |
| Minnesota Timberwolves | National Basketball Association | Minneapolis | 1989 | Hubert H. Humphrey Metrodome, Target Center |
| Minnesota Twins | Grandes Ligas de Béisbol | — | 1901 | Target Field, American League Park, Metropolitan Stadium, Hubert H. Humphrey Metrodome, Boundary Field, Griffith Stadium |
| Minnesota United Football Club | Major League Soccer | Minneapolis | 2015 | Allianz Field, Huntington Bank Stadium |
| Minnesota Vikings | National Football League | 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 | — | — | — | Antiguo Estadio Nacional del Perú |
| Montecatini Terme Basketball | — | Montecatini Terme | 1949 | PalaTerme |
| Montreal Expos | Grandes Ligas de Béisbol | — | 1969 | Estadio Olímpico de Montreal, Jarry Park Stadium |
| Montreal Maroons | — | — | 1924 | Forum de Montreal |
| MTVB Herons Basket | — | Montecatini Terme | — | — |
| Napoli Basketball | — | Nápoles | 2011 | — |
| Nashville Predators | — | — | 1998 | Bridgestone Arena |
| Nashville Soccer Club | Major League Soccer | Nashville | 2017 | Geodis Park, Nissan Stadium |
| NBA New Basket A-Zena | — | Génova | — | — |
| New Basket Brindisi | Lega Basket Serie A | Bríndisi | 1992 | PalaPentassuglia |
| New Basket Palestrina | — | — | — | — |
| New England Patriots | National Football League | Foxboro | 1959 | Gillette Stadium |
| New England Revolution | Major League Soccer | Foxboro | 1995 | Gillette Stadium |
| New Jersey Devils | — | Newark, East Rutherford | 1974 | Izod Center, Prudential Center |
| New Orleans Pelicans | National Basketball Association | Nueva Orleans | 2002 | Paycom Center, Smoothie King Center |
| New Orleans Saints | National Football League | — | 1967 | Louisiana Superdome |
| New Polibasket San Bonifacio | — | — | — | — |
| New York City FC | Major League Soccer | Nueva York | 21 de mayo de 2013 | Yankee Stadium |
| New York Giants | National Football League | Área metropolitana de Nueva York | 1925 | MetLife Stadium |
| New York Giants | — | — | — | — |
| New York Islanders | — | Brooklyn, Elmont, Uniondale | 1972 | UBS Arena, Barclays Center, Nassau Veterans Memorial Coliseum |
| New York Jets | National Football League | Nueva York, East Rutherford | 1960 | MetLife Stadium |
| New York Knicks | National Basketball Association | Nueva York | 1946 | Madison Square Garden, Madison Square Garden (1925), 69th Regiment Armory |
| New York Mets | Grandes Ligas de Béisbol | — | 1962 | Citi Field |
| Nova Virtus Ragusa | — | Ragusa | — | — |
| NPC Rieti | — | Rieti | 2011 | — |