Ma Alalta - Ethiopia
Maca - Chile         Extra
Macauley Island - New Zealand
Macdonald - Pacific Ocean
Machin - Colombia
Macizo de Larancagua - Bolivia
Macizo de Pacuni - Bolivia
Maderas - Nicaragua
Madilogo - Papua New Guinea
Magado Crater - Kenya
Magaso - Philippines
Mageik - Alaska         Extra
Mahagnoa - Philippines
Mahawu - Indonesia         Extra
Mahukona - Hawaii
Maiden Peak - Oregon
Maipo - Chile/Argentia
Maitara - Indonesia
Makaturing - Philippines
Makian - Indonesia         Extra
Makushin - Alaska         Extra
Makura-jima - Japan
Malabar - Indonesia
Malang Plain - Indonesia
Malapi Hill - California
Malinao - Philippines
Malindang - Philippines
Malindig - Philippines
Mallahle - Ethiopia/Eritrea
Maly Payalpan - Russia
Maly Semiachik - Russia         Extra
Mammoth - California
Mamuya - Indonesia
Managlase Plateau Volcanic Field - Papua New Guinea
Manam - Papua New Guinea         Extra
Manda Hararo - Ethiopia
Manda-Inakir - Ethiopia/Djibouti
Mandalagan - Philippines
Manengouba - Cameroon
Manuk - Indonesia
Maquiling - Philippines
Marapi - Indonesia
Marchena - Galapagos Islands         Extra
Mardarbunga - Iceland
Mare - Indonesia
Marion Island - Indian Ocean
Mariveles - Philippines         Extra
Markagunt Plateau Volcanic Field - Utah
Maroa - New Zealand
Marsabit - Kenya         Extra
Martin - Alaska         Extra
Masaraga - Philippines
Masaya - Nicaragua         Extra
Mascota Volcanic Field - Mexico
Mashkovtsev - Russia         Extra
Mashu - Japan
Massif de la Grille - Comore Islands
Mat Ala - Ethiopia
Matthew Island - Vanuatu
Matupit - Papua New Guinea
Matutum - Philippines
Maug - Mariana Islands
Maui - Hawaii
Mauna Kea - Hawaii         Extra
Mauna Loa - Hawaii         Extra
May-ya-moto Volcanic Field - Dem. Rep. of the Congo
Mayon - Philippines         Extra         Extra
Mayor Island - New Zealand
Mazama - Oregon
McBride Volcanic Province - Australia
McDonald Islands - Australia
McLoughlin - Oregon
Meager - Canada
Medicine Lake - California         Extra
Medvezhia - Russia
Mega Basalt Field - Ethiopia/Kenya         Extra
Megata - Japan
Mehetia - Pacific Ocean (France)
Meidob Volcanic Field - Sudan
Melbourne - Antarctica
Melimoyu - Chile
Membo - Japan
Menan Buttes - Idaho
Mencheca - Chile
Mendeleev - Russia
Menegai - Kenya         Extra
Mentolat - Chile
Merapi - Indonesia         Extra
Merbabu - Indonesia         Extra
Mere Lava - Vanuatu         Extra
Merriam - Arizona
Meru - Tanzania         Extra
Methana - Greece         Extra
Metis Shoal - Tonga
Mezhdusopochny - Russia
Michael - S. Sandwhich Islands         Extra
Michoacan-Guanajuato Volcanic Field - Mexico
Micotrin - Dominica
Middle Gobi - Mongolia
Middle Sister - Oregon
Midway - Pacific
Mikeno - Uganda
Milbanke Sound Group - Canada
Milne - Russia
Milos - Greece         Extra
Minami-Hiyoshi - Japan
Minchinmavida - Chile
Miravalles - Costa Rica
Miyake-jima - Japan
Mocho-Choshuenco - Chile         Extra
Moffett - Alaska         Extra
Moiro - Bolivia
Mojanda - Ecuador         Extra
Molokai - Hawaii
Mombacho - Nicaragua
Momotombo - Nicaragua         Extra
Monaco Bank - Azores
Monaro Volcanic Province - Australia

Bombala
Brothers
Cathcart
Mount Cooper
The Peak
Red Cliff

Mondaca - Chile
Mono Craters - California
Mono Lake Volcanic Field - California
Monowai Seamount - New Zealand
Montagu - S. Sandwich Islands
Montoso - Nicaragua
Montserrat (see Soufriere Hills)
Morale Claim - Arizona
Morne au Diable - Dominica
Morne Diablotins - Dominica
Morne Patates - west indies
Morne Plat Plays - Dominica
Morne Trois Pitons - Dominica
Morne Watt - Dominica
Moti - Indonesia Extra
Motlav - Vanuatu
Moua Pihaa - Pacific Ocean (France)
Mousa Alli - Ethiopia/Eritrea/Djibouti
Mousgue - Chad
Moyuta - Guatemala
Mud Springs - Nevada
Muhavura - Uganda/Rwanda
Mukaiyama - Japan
Mundua - Papua New Guinea
Muria - Indonesia
Musa River Volcanic Field - Papua New Guinea
Mutnovsky - Russia Extra
Mutsu-Hiuchi-dake - Japan
Myoko - Japan