ClubLocationLeagueTierFounded
MKS Ryki—IV Liga - Lubelska—1948
MPS—Kolmonen - Etelä B—1948
Maccabi Paris—Dissolved 2012—1948
Maleyat Kafr El Zayat—Egyptian Second Division B—1948Marck—Régional 1 - Hauts-de-France—1948
Markt Allhau—II. Liga Süd - Burgenland—1948
Mbabane Swallows—Premier League of Eswatini—1948
Metalac——1948
Metalurgi Rustavi—Dissolved 2016—1948
Mickleover—Northern Premier League - Premier Division—1948Mladost Proložac—1. ŽNL Splitsko-Dalmatinska—1948
Mladost Velika Obarska—Regionalna Liga RS - Istok—1948Montceau Bourgogne—Régional 1 - Bourgogne-Franche-Comté—1948
Montijo—Dissolved 2007—1948
Motor Hennigsdorf—Dissolved 1998—1948
Myongji University—U League—1948
Málaga—Segunda División—1948
Mándok VSE—MB I - Szabolcs-Szatmár-Bereg—1948
Nagdlunguaq-48—Greenlandic Football Championship—1948
Narlıdere Belediyespor—İzmir 1. Amatör Ligi—1948Narlıdere Belediyespor—İzmir 1. Amatör Ligi—1948
Nea Salamis—B Katigorias Kyprou—1948
Nuno Tristão—Segunda Divisão de Guiné-Bissau—1948Oberneuland—Bremen-Liga—1948
Oleksandriya—UPL—1948Omonia—A Katigorias Kyprou—1948Operário—Campeonato de Futebol dos Açores—1948Orzeł Bębło—Klasa A - Kraków—1948Oststeinbeker SV—Landesliga Hamburg - Hansa—1948
PAO Vardas—Gamma Ethniki - Group 9—1948