- Magnin, Charles
- Magnolia
- Magnus, Eduard
- Magnus, Heinrich Gustav
- Magnusson, Finn
- Magoffin
- Maine (state)
- Maine (province)
- Malte-Brun
- Mammee Apple
- Mammoth
- Mammoth Cave
- Manatee (county)
- Manayunk
- Manby, George William
- Mancha, La
- Manche, La
- Manchester (New Hampshire)
- Manchester (Connecticut)
- Manila
- Manila (fibre)
- Marathon (county)
- Maratti, Carlo
- Marbeau, Jean Baptiste François
- Marbeck, John
- Marble
- Marble, Manton
- Marblehead
- Marjoram
- Mark, Saint
- Marriage
- Marseillaise
- Marshall, John
- Marx, Karl
- Maryland
- Mason and Dixon's Line
- Massachusetts
- Massachusetts Indians
- Massasoit
- Matthew, Saint
- Matthisson, Friedrich von
- Maximin
- Maxwell, James Clerk
- Mayer, Alfred Marshall
- Mayer, Brantz
- Mayer, Johann Tobias
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- Mobile (river and bay)
- Mobile (county)
- Mobile (city)
- Mobile Point
- Möbius
- Modocs
- Mœris
- Moffat, Robert
- Mogila, Peter
- Moller, Georg
- Möllhausen, Balduin
- Monroe, James
- Montaigne, Michel, seigneur de
- Montalant, Mlle
- Montalembert
- Montalvan, Juan Perez de
- Montana
- Montanelli, Giuseppe
- Montgomery (Alabama)
- Montour
- Montpelier
- Moravians
- Morawa
- Moray, Earl of
- Morayshire
- Morazan, Francisco
- Morbihan
- Mordants
- Mordaunt, Charles
- Mordvins
- More, Hannah
- More, Henry
- More, Sir Thomas
- Mörike, Eduard
- Mormons
- Morristown
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