- Lodge, Giles Henry
- Loefling, Peter
- Loewenstern, Isidore
- Loewenthal, Isidor
- Loher, Franz von
- Longstreet, William
- Longstreth, Miers Fisher
- Longworth, Nicolas
- Lossing, Benson John
- Lothrop, Harriett Mulford
- Lothrop, Samuel Kirkland
- Lothrop, Thomas
- Lott, John A.
- Lottenschiold, Mathias
- Lotter, Friedrich August
- Lovejoy, Elijah Parish
- Lowe, Thaddeus S. C.
- Lowell, James Russell
- Lowell, John
- Lowther, George
- Lucas, Robert
- Ludewig, Hermann Ernst
- Ludwick, Christopher
- Lunt, George
- Lussan, Raveneau de
- Lutz, Nicholas
- Luz-Caballero, José de la
- Luzenberg, Charles Aloysius
- Lyon, John Christian
- McArthur, Duncan
- McCallum, Daniel Craig
- McCook, Daniel
- McDonald, Flora
- McEntee, Jervis
- McGarvey, John William
- McGee, Thomas D'Arcy
- McGee, W J
- Macgeorge, Robert Jackson
- McGill, Alexander Taggart
- McGill, James
- McGillivray, Alexander
- McGroarty, Stephen Joseph
- McGuffey, William Holmes
- McIntosh, James McKay
- McIntosh, Lachlan
- McIntosh, William
- Mack, John Martin
- Mackenna, Juan
- McKeon, John
- Mackey, John
- Mackie, John Milton
- Mackie, Josias
- McKim, James Miller
- McKim, Robert
- McLene, Jeremiah
- McMaster, John Bach
- McMillan, James
- Macready, William Charles
- Madockawando
- Maelzl, John Nepomuk
- Maisch, John Michael
- Makemie, Francis
- Makin, Thomas
- Malartic, Anne Joseph Hyppolyte
- Malouet, Pierre Victor, Baron
- Manigault, Gabriel
- Manley, Henry De Haven
- Mann, Ambrose Dudley
- Mann, Cyrus
- Mann, Horace
- Mansfield, Jared
- Marbois, Francois de Barbe
- Marcou, Jules
- Maretzek, Max
- Marggraf, George
- Marsh, Charles
- Marsh, Othniel Charles
- Marsh, Samuel
- Marsh, Sylvester
- Marshall, Humphrey
- Marshall, James Wilson
- Marshall, Thomas (planter)
- Marshall, Thomas (soldier)
- Martineau, Harriet
- Mason, Caroline Atherton
- Massasoit
- Massie, Nathaniel
- Materna, Amalie
- Mather, Fred
- Mather, Frederic Gregory
- Mather, Moses
- Mather, Richard
- Mather, Richard Henry
- Mather, Samuel Holmes
- Mather, William Williams
- Mayer, Brantz
- Mayer, Constant
- Mayer, Philip Frederick
- Mayes, Joel Bryan
- Mayo, Amory Dwight
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- Meagher, Thomas Francis
- Medberry, Rebecca B.
- Medill, Joseph
- Medill, William
- Meeker, Joseph Rusling
- Megapolensis, Johannes
- Meigs, Return Jonathan
- Meilleur, Jean Baptiste
- Mello, Francisco Manoel
- Melsheimer, Frederick Valentine
- Melvil-Bloncourt, Sainte Suzanne
- Memminger, Charles Gustavus
- Menken, Adah Isaacs
- Meriam, Ebenezer
- Merian, Marie Sibylle
- Merriam, George
- Merry, Ann
- Messein, Charles Francis Bailly de
- Messinger, Robert Hinckley
- Messer, Asa
- Metcalf, Theron
- Meyer, Bernhard
- Meyer, Hermanus
- Miantonomo
- Micconopy
- Michælius, Jonas
- Michaux, André
- Michel, Dieudonné Gabriel Lucien
- Michel, Jacques Léonard
- Miller, Alfred Jacob
- Miller, Charles Henry
- Miller, Cincinnatus Heine
- Miller, John Henry
- Minor, Robert Crannell
- Minuit, Peter
- Mirabeau, Boniface Riquetti, Vicomte de
- Mociño, José
- Modjeska, Helena
- Moeller, Louis Charles
- Moise, Penina
- Moldenke, Edward Frederick
- Möller, Henry
- Möllhausen, Balduin
- Montauband
- Montbars
- Montcalm Gozon de Saint Véran, Louis Joseph, Marquis de
- Montez, Lola
- Montezuma I.
- Montgomery, Richard
- Moore, Jacob Bailey
- Moreau, Jean Victor
- Morgan, Matthew Somerville
- Morgan, Michael Ryan
- Morgan, Miles
- Morris, Edward Joy
- Morrow, Jeremiah
- Morton, George
- Morse, Jedidiah
- Morton, Henry Jackson
- Morton, Thomas
- Morwitz, Edward
- Mosby, John Singleton
- Mosby, Mary Webster
- Mosher, Jacob Simmons
- Mosler, Henry
- Mosquera, Ruy Garcia
- Mosquera, Tomás Cipriano de
- Moss, John Calvin
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- Muhlenberg, Henry Melchior
- Muller, Albert A.
- Müller, Nikolaus
- Munk, Jans
- Munn, George F.
- Munn, Orson Desaix
- Munsell, Joel
- Munson, Æneas
- Munson, James Eugene
- Murat, Napoléon Achille
- Murillo-Toro, Manuel
- Nasimben, Pedro
- Nason, Elias
- Nassau-Siegen, John Maurice, Prince of
- Nast, Thomas
- Nast, William
- Natividade, José da
- Nau, Jacques Jean David
- Naudain, Arnold
- Navailles, Charles
- Necochea, Eugenio
- Neé, Isidore Charles Sigismond
- Nelson, Charles Alexander
- Netzahualcoyotl
- Neuendorff, Adolph Heinrich Anton Magnus
- Neuville, Jean Guillaume, Baron Hyde de
- Neuville, Philippe Buache de la
- Neuville, Chevalier de la
- Neu-Wied, Alexander Maximilian, Prince of
- Nevada, Emma Wixom
- Newberry, John Strong
- Newberry, Oliver
- Nichols, William Ripley
- Nicolay, John George
- Niebuhr, Sigismund
- Niel, Frédéric Guillaume Amédée Ferdinand
- Niemcewicz, Julian Ursin, Count
- Niemeyer, Conrade Jacob de
- Niemeyer, John Henry
- Nieto, José Apolinario
- Nieto, Vicente
- Nieuwhof, Johann Jacob
- Nilsson, Christine
- Nina, João Estevam Miguel da Silva
- Ninde, William Xavier
- Nindemann, William Friedrich Carl
- Ninegret
- Niño, Andres
- Niño, Pedro Alonso
- Nipher, Francis Eugene
- Noble, John Willock
- Nolte, Vincent
- Noort, Olivier Van
- Nordheimer, Isaac
- Nordhoff, Charles
- Nores, Simon de
- Noyes, Edward Follensbee
- Noyes, Eli
- Noyes, George Rapall
- Noyes, James
- Noyes, John Humphrey
- Nuñez-Vela, Blasco
- Nurse, Rebecca
- Nutt, Cyrus
- Nutt, George Washington Morrison
- Nuttall, Enos
- Nuttall, Thomas
- Nye, Edgar Wilson
- Obando, José María
- O'Beirne, Thomas Lewis
- Ober, Frederic Albion
- Oberholtzer, Sara Louisa
- Obookiah, Henry
- O'Conor, Thomas
- Oconostota
- Odenheimer, William Henry
- O'Donovan, William Rudolf
- Oersted, Anders Sandöe
- Oertel, Johannes Adam
- Oiouhaton, Teresa
- Ojéda, Alonso de
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- Olmsted, Denison
- Olmsted, Frederick Law
- Olney, Edward
- Olney, Jeremiah
- Olney, Jesse
- Olotoraca
- Olssen, William Whittingham
- Olsson, Olof
- O'Mahony, John Francis
- Orton, Azariah Giles
- Orton, Edward
- Oscanyan, Hatchik
- Osceola
- Osculati, Gaetano
- Ottendorfer, Oswald
- Osterhaus, Peter Joseph
- Otterbein, Philip William
- Ottigny, Charles d'
- Otto, Charles
- Otto, John Conrad
- Ouray
- Oureouharé
- Page, Emily Rebecca
- Page, William
- Palisot de Beauvois, Ambrose Marie François Joseph
- Palmer, Ray
- Parker, Amasa Junius
- Parker, Daniel
- Parker, Edward Griffin
- Parker, Edward Lutwyche
- Parker, Ely Samuel
- Parker, Foxhall Alexander
- Parker, Francis Wayland
- Parker, Henry
- Parker, Hyde
- Parker, Isaac
- Parker, James
- Parker, Joel (jurist)
- Parker, Joel (clergyman)
- Parker, Joel (governor)
- Parker, John
- Parker, John Adams
- Parker, Linus
- Parker, Nahum
- Parker, Permelia Jane Marsh
- Parker, Peter (officer)
- Parker, Peter (clergyman)
- Parker, Richard Elliott
- Parker, Samuel (bishop)
- Parker, Samuel (clergyman)
- Parker, Theodore
- Parker, Thomas (clergyman)
- Parker, Thomas (soldier)
- Parker, Willard
- Parkhurst, Charles Henry
- Parkinson, Richard
- Parkman, Francis
- Parris, Samuel
- Parrish, John
- Passaconaway
- Pastorius, Francis Daniel
- Patterson, Robert (pioneer)
- Paullin, William
- Paullu-Inca
- Pausch, George
- Pavy, Octave Pierre
- Peabody, Andrew Preston
- Peabody, Elizabeth Palmer
- Peabody, Ephraim
- Pearson, Jonathan
- Penn, William
- Perkins, Elisha
- Perkins, Frederic Beecher
- Perkins, George Hamilton
- Perkins, George Henry
- Pettee, Otis
- Pfeiffer, Carl
- Pfeiffer, Ludwig Georg
- Phelan, John Dennis
- Philes, George Philip
- Philip
- Philippes de Kerhallet, Charles Marie
- Phillipps, Adelaide
- Phillips, Barnet
- Phillips, George
- Phillips, Henry M.
- Phillips, James
- Phillips, John
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