 | Magnum Club Italy | Italy | | | | |
| Main Pain | GER | Frankfurt | 1992 | | |
 | Mainely Bears | Maine | | | | |
 | Mall City Cruisers | MI | Kalamazoo | | | |
 | Manchester Super Chain | ENG | Manchester | 1983 | | |
| Manitoba Bears | CAN | Manitoba | | | |
 | Mannheim Bears | Germany | | | | |
| Mansfield Bucks | VT | Burlington | | | |
 | MasT | Ga | Atlanta | | | |
 | MasT | MA | Boston | | | |
 | MasT | New Jersey | | 2001 | | |
 | MasT | IL | Chicago | 1988 | | |
 | MasT | OH | Cincinatti | | | |
 | MasT (Gay Male) | DC | Washington | 1999 | | |
 | MasT (Pansexual) | DC | Washington | | | |
 | MasT Greater LA | CA | Los Angeles | | | |
 | MasT | Hampton Roads | | | | |
 | MasT | TX | Houston | | | |
 | Mast | FL | Jacksonville | 2003 | | |
 | MasT | MO | Kansas City | 2003 | | |
 | MasT | CA | Los Angeles | | | |
 | MasT | NV | Las Vegas | | | |
 | MasT | MN | Minneapolis | | | |
 | MasT | Oklahoma | | | | |
 | MasT | LA | New Orleans | | | |
 | MasT | PA | Philadelphia | | | |
 | MasT | AZ | Phoenix | | | |
 | MasT | VA | Richmond | | | |
 | MasT | CA | San Francisco | 1999 | | |
 | MasT | Maine | | | | |
 | MasT | NC | Triad | | | |
 | MasT | AZ | Tucson | | | |
 | Mates | MA | Providence | 1994 | Yes | |
| Mavericks | NM | Santa Fe | | | |
 | MC Faucon Montreal | CAN | Montreal | | | |
 | MC Keno | CAN | Montreal | 1970-11-01 00:00:00 | | |
| MC Milano | Germany | | | | |
 | MC Rhone Alpes | FR | Lyon | | | |
| Mecs en Caoutchiuc | Fr | Dammie Les Lys | 1994 | | |
 | Meitsters Der Manner | Fl | Orlando | 1977 | | |
| Melbourne Bondage Club | AU | Melbourne | 1990 | | |
| Melbourne Leather Men | AU | Melbourne | 1991 | | |
| Memphis Bears | | | | | |
| Memphis L/L Alliance | TN | Memphis | 1992 | | |
 | Memphis Power Exchange | TN | Memphis | | | |
| Men Bound by Leather | CA | Los Angeles | | | |
 | Men in Boots | CAN | Vancouver | 1985 | | |
 | Men of Discipline | CA | San Francisco | | | |
 | Men of Discipline | DC | Washington | | | |
 | Men of Dungeons | | | | | |
| Men of Leather | TN | Memphis | | | |
| Men of Leather | AU | Melbourne | | | |
 | Men Of Phoenix | Rhode Island | | 2003 | 2006 | |
| Men of Renowned Edgeplay (MORE) | Co | Denver | | | |
| Men of Rubber | IL | Chicago | 1996 | | |
| Men Shaving Men | CAN | Vancouver | 1989 | | |
 | Menamore | NC | Wilmington | 1989 | January 23, 2007 | |
 | Mens Club Arhus | Denmark | | 1978 | | |
 | Men's Welcoming Committee | WA | Seattle | | | |
 | Metro Bears | NY | New York | 1995 | | |
| Metro Leather Society | MI | Royal Oak | 1993 | | |
 | Mi Chat Ohs | Ohio | | | | |
 | Michigan Rope | MI | Detroit | | | |
 | Mid America Fists in Action (MAFIA) | Il | Chicago | 1979 | | |
 | Mid Michigan Bears | | | 1994 | | |
 | Mid America Conference of Clubs (Originally Midwest) | IL | Chicago | 1973 | | |
 | Midlands Power Exchange | SC | Columbia | | | |
| Midlands Communication Network | NE | Omaha | | | |
| Midnight Leather Club | NY | Penfield | | | |
| Midnight Police leather Society | NY | Rochester | 1988 | | |
 | Midwest Bear Pack | IN | Indianapolis | | | |
 | Mike's Men | MA | Boston | 1989 | | |
| Mile High Handballers | Colorado | | | | |
| Military & Police Uniform Association | CA | West Hollywood | | | |
 | Militia MC | VA | Norfolk | 1975 | | |
| Milwaukee Bondage Club | WI | Milwaukee | 1990 | | |
 | Milwaukee Knights | WI | Milwaukee | | | |
 | Miners | Scotland | Grenock | | | |
 | Mini Bikes MC | LA | New Orleans | 1975 | | |
 | Minnesota Leather Den (women) | MN | Minneapolis | 1992 | 1996 Underground | |
 | Minnesota Leather Encounter | MN | Minneapolis | 1992 | | |
| Minnesota Marauders | MN | Minneapolis | 1979 | | |
 | Minnesota Norsemen | Minnesota | | 1975 | | |
 | Minnesota Power Exchange | Minnesota | | | | |
| Minnesota Stocks, Debentures and Bonds (MSDB) | Minnesota | | 1999 | | |
 | Minnesota Storm Patrol | MN | Minneapolis | 2003 | | |
| Minotaurs BC | NH | Concord | | | |
 | Misfits | TX | Houston | 1992 | | |
 | Mississippi Alternative Social Kinks (MASK) | Mississippi | | | | |
| Missouri Association of Clubs | Missouri | | 1977 | | |
| MLC Munchen | GER | Munchen | | | |
| MLC Veneto | Bedin | | | | |
| MLLA | FL | Lakeland | | | |
 | MOB New England (women) | MA | Boston | | | |
| Mobile Man Van Club | Mi | Detroit | 1977 | | |
 | Monterey Dons | California | | 1973 | | |
| Mooncussers MC | MA | Provincetown | | | |
| Moonlight Leather Association of the Deaf (MLAD) | CA | San Diego | 1991 | | |
 | Moonshine Bears | Kentucky | | | | |
| Moor Cocks | New York | | 1985 | | |
| Mortifoto (scat) | Holland | Haag | | | |
| Motivation | England | | | | |
 | Moto Leather Club Veneto | Italy | Veneto | | | |
 | Motor City Bears | Mi | Detroit | 1989 | | |
 | Motorcity Men of Leather | Mi | Detroit | 1989 | | |
 | Motorcyclemen of New Mexico | NM | Albuquerque | 1981 | | |
| Mountain Men of Leather | Co | Denver | 1977 | | |
 | Mountain State Bears | WV | Charleston | | | |
 | Mountain State Knights | West Virginia | | | | |
 | Moving Violations | MA | Boston | | | |
| MP Bands | CA | Canoga Park | | | |
 | MPs Northeast | MA | Lowell | | | |
 | MS Amsterdam | Amsterdam | | 1970 | | |
 | MS Panther Cologne Germany | Germany | | 1974 | | |
| Ms Rocky Mountain Leather Association | CO | Denver | 1985 | 1986 | |
 | MS Rotterdam | | | | | |
| MSC - MSC | England | | | | |
| MSC (SW) | netherlands | | | | |
| MSC Barcelona | England | | | | |
| MSC Belgica | Belgium | | 1971 | 1977 | |
 | MSC Belgium | Belgium | | 1977 | | |
 | MSC Berlin | GER | Berlin | 1974 | | |
 | MSC Bournemouth | England | | | | |
 | MSC East Mercia | Germany | | 1982 | | |
 | MSC Finland | Finland | | 1976 | | |
 | MSC Frankfurt | GER | Frankfurt | | | |
 | MSC Groningen | Netherlands | | 1976 | | |
 | MSC Hallanshire | England | | | | |
 | MSC Hamburg | GER | Hamburg | 1974 | | |
 | MSC Hannover | Germany | | | | |
 | MSC Koln | | | | | |
 | MSC Iceland | Iceland | | 1985 | | |
 | MSC London | ENG | London | 1973 | | |
 | MSC Madrid | Spain | | | | |
 | MSC Midland Link | UK | Worchester | 1974 | | |
| MSC Northeast | England | | | | |
 | MSC Northwest | England | | 1975 | | |
 | MSC Pennine Chain | UK | Chesire | 1974 | | |
 | MSC Rheim Main | Germany | | 1971 | | |
 | MSC Rote Erde | | | | | |
 | MSC Scotland | Scotland | | 1974 | | |
| MSC Solent | UK | SOlent | | | |
| MSC Southwest | | | | | |
| MSC Sudwest | Germany | | | | |
| MSC Suisse Romande | Lausanne | | 1981 | | |
| MSC Toronto | CAN | Toronto | | | |
| MSC Viking | Koln | | | | |
| Mud Buddies | CA | San Diego | | | |
 | Mud Men (changed name to Sludgemasters) | TX | Houston | 1994 | | |
| Munchner Leder Club | NY | Nova | 1975 | | |
 | Munich Bears | GER | Munich | | | |
 | Munich Leather Club | GER | Munich | | | |
| Muscle Mates | NY | New York | | | |
 | Music City Bears | TN | Nashville | | | |
 | Mustang | TX | Houston | | | |
 | Myrtle Beach Kink | NC | Myrtle Beach | | | |
 | Mythos | CAN | Calgary | 2002 | | |