| 1 | M.M.Warburg & CO | Germany |
| 2 | M&S Bank | UK |
| 3 | M&T Bank | USA |
| 4 | Macquarie Bank | Australia |
| 5 | Maerki Baumann & Co. | Switzerland |
| 6 | Magyar Bank | USA |
| 7 | Maiwand Bank | Afghanistan |
| 8 | Malvern Federal Savings Bank | USA |
| 9 | Manasqaun Savings Bank | USA |
| 10 | Manufacturers Bank | USA |
| 11 | Marfin Bank (Romania) | Romania |
| 12 | Marion County Bank | USA |
| 13 | Maritime Bank | Russia |
| 14 | Marquette Bank | USA |
| 15 | Mascoma Savings Bank | USA |
| 16 | Mashreq Bank | UAE |
| 17 | Mashreq Bank (Qatar) | Qatar |
| 18 | Mashreq Neo | UAE |
| 19 | Masraf Al Rayan | Qatar |
| 20 | Mauritius Commercial Bank | Mauritius |
| 21 | Maybank | Malaysia |
| 22 | Maybank Singapore | Singapore |
| 23 | mBank | Czech Republic |
| 24 | mBank | Poland |
| 25 | MBSB Bank | Malaysia |
| 26 | MC Bank Rus | Russia |
| 27 | MCB Bank | Pakistan |
| 28 | MCB Islamic Bank | Pakistan |
| 29 | MCB Madagascar | Madagascar |
| 30 | McFarland State Bank | USA |
| 31 | Mechanics and Farmers Bank | USA |
| 32 | Mechanics Bank | USA |
| 33 | Medicinos Bankas | Lithuania |
| 34 | MeDirect Bank (Malta) | Malta |
| 35 | MeDirect Belgium | Belgium |
| 36 | Meezan Bank | Pakistan |
| 37 | Megabank | Ukraine |
| 38 | Memo Bank | France |
| 39 | Mercantile Discount Bank | Israel |
| 40 | Mercedes-Benz Bank | Germany |
| 41 | Mercedes-Benz Bank Rus | Russia |
| 42 | Merchants & Farmers Bank | USA |
| 43 | Meridian Bank | USA |
| 44 | Meridian Trade Bank | Latvia |
| 45 | Merrill Lynch Bank and Trust Company (Cayman) | Cayman Islands |
| 46 | Merrimack County Savings Bank | USA |
| 47 | MetaBank | USA |
| 48 | Metairie Bank | USA |
| 49 | Metallinvestbank | Russia |
| 50 | Metallurgical Commercial Bank (Metcombank) | Russia |
| 51 | Metcalf Bank | USA |
| 52 | MetLife Bank | USA |
| 53 | Metro Bank | UK |
| 54 | Metrobank | Philippines |
| 55 | Metropolitan Bank | USA |
| 56 | Metropolitan Bank | China |
| 57 | Metzler Bank | Germany |
| 58 | MFC Merchant Bank | Malta |
| 59 | MIDBank | Egypt |
| 60 | MidFirst Bank | USA |
| 61 | Midland States Bank | USA |
| 62 | MidSouth Bank | USA |
| 63 | Midwest BankCentre | USA |
| 64 | Migrosbank | Switzerland |
| 65 | MIKO-BANK | Russia |
| 66 | Milford Bank | USA |
| 67 | Millenium Bank | Russia |
| 68 | Millennium bcp | Portugal |
| 69 | Millington Savings Bank | USA |
| 70 | Mir Business Bank | Russia |
| 71 | Mirabank | Serbia |
| 72 | Mission Bank | USA |
| 73 | Mizrahi-Tefahot Bank | Israel |
| 74 | Mizuho Bank | Japan |
| 75 | Mizuho Bank (Moscow) | Russia |
| 76 | Mizuho Financial Group | Japan |
| 77 | MNB Bank | USA |
| 78 | Modern Bank | USA |
| 79 | Modulbank | Russia |
| 80 | Moldindconbank | Moldova |
| 81 | Moldova Agroindbank | Moldova |
| 82 | MONETA Money Bank | Czech Republic |
| 83 | monobank | Ukraine |
| 84 | Monona Bank | USA |
| 85 | Monte dei Paschi di Siena (MPS) | Italy |
| 86 | Montecito Bank & Trust | USA |
| 87 | Monzo Bank | UK |
| 88 | Moody National Bank | USA |
| 89 | MoraBanc | Andorra |
| 90 | Morgan Stanley | USA |
| 91 | Mortgage and Land bank of Latvia | Latvia |
| 92 | Morton Community Bank | USA |
| 93 | Moscow Industrial Bank | Russia |
| 94 | Moscow-City Bank | Russia |
| 95 | Moskommertsbank | Russia |
| 96 | Mosoblbank | Russia |
| 97 | Motus Bank | Canada |
| 98 | MountainOne Bank | USA |
| 99 | Mox Bank | Hong Kong |
| 100 | MTBank | Belarus |
| 101 | MTS Bank | Russia |
| 102 | MUFG Alternative Fund Services (Cayman) | Cayman Islands |
| 103 | MUFG Bank | Japan |
| 104 | MUFG Bank (Eurasia) | Russia |
| 105 | Municipal Bank AD | Bulgaria |
| 106 | Mwanga Hakika Bank | Tanzania |
| 107 | MYbank | China |
