Packard, Alpheus Spring, Jr (1839–1905)

Packard, David (1912–1996)

Packard, James W(ard) (1863–1928)

Page, Charles (Grafton) (1812–1868)

Pagenstecher, Hermann (1844–1932)

Paget, James (1814–1899)

Palade, George (1912–2008)

Pallas, Peter Simon (1741–1811)

Palmer, Daniel David (1845–1913)

Paneth, Friedrich Adolf (1887–1958)

Panofsky, Hans (Arnold) (1917–1988)

Panofsky, Wolfgang K(urt) H(ermann) (1919–2007)

Papanicolaou, George Nicholas (1883–1962)

Papin, Denis (1647–c. 1712)

Pappus of Alexandria (lived c. AD 300–350)

Paracelsus, Philippus Aureolus (1493–1541)

Pardee, Arthur Beck (1921– )

Pardue, Mary Lou (1933– )

Paré, Ambroise (1509–1590)

Parker, Willard (1800–1884)

Parkes, Edmund Alexander (1819–1876)

Parkinson, James (1755–1824)

Parry, Caleb Hillier (1755–1822)

Parsons, Charles Algernon (1854–1931)

Parsons, William (1800–1867)

Pascal, Blaise (1623–1662)

Pasteur, Louis (1822–1895)

Patt, Yale N.

Paul, Wolfgang (1913–1993)

Pauli, Wolfgang (1900–1958)

Pauling, Linus Carl (1901–1994)

Paulus Aegineta (625–690)

Pavlov, Ivan Petrovich (1849–1936)

Payne-Gaposchkin, Cecilia Helena (1900–1979)

Peano, Giuseppe (1858–1932)

Pearson, Karl (1857–1936)

Pearson, Thomas Gilbert (1873–1943)

Pecquet, Jean (1622–1674)

Pedersen, Charles (1904–1990)

Peebles, (Phillip) James (Edwin) (1935– )

Peierls, Rudolf Ernst (1907–1995)

Peirce, Benjamin (1809–1880)

Pelletier, Pierre-Joseph (1788–1842)

Peltier, W. Richard

Pelton, Lester Allen (1829–1918)

Pender, John (1815–1896)

Penfield, Wilder Graves (1891–1976)

Pennant, Thomas (1726–1798)

Penney, William George (1909–1991)

Pennington, Mary Engle (1872–1952)

Pennycuick, Colin James (1933– )

Penrose, Roger (1931– )

Penzias, Arno Allan (1933– )

Pepperberg, Irene M(axine) (1949– )

Peregrinus, Petrus (born c. 1220)

Perelman, Grigory (1966– )

Perey, Marguérite (Catherine) (1909–1975)

Perkin, William Henry (1838–1907)

Perkins, Jacob (1766–1849)

Perl, Martin Lewis (1927–2014)

Perlmutter, Saul (1959– )

Perrin, Jean Baptiste (1870–1942)

Persoon, Christiaan Hendrik (1761–1836)

Pert, Candace Dorinda Beebe (1946–2013)

Perutz, Max Ferdinand (1914–2002)

Peter of Abano (1257–1316)

Peterson, Roger Tory (1908–1996)

Petit, Alexis(-Thérèse) (1791–1820)

Pfeffer, Wilhelm Friedrich Philipp (1845–1920)

Pfeiffer, Richard Friedrich Johannes (1858–1945)

Phillips, James C(harles) (1933– )

Phillips, William D(aniel) (1948– )

Physick, Philip Syng (1768–1837)

Piaget, Jean (1896–1980)

Piazzi, Giuseppe (1749–1826)

Picard, (Charles) Emile (1856–1941)

Picard, Jean (1620–1682)

Piccard, Auguste Antoine (1884–1962)

Piccard, Jacques Ernest Jean (1922–2008)

Pickering, Edward Charles (1846–1919)

Pickering, William Henry (1858–1938)

Picotte, Susan La Flesche (1865–1915)

Pierce, John Robinson (1910–2002)

Piggott, Stuart (1910–1996)

Pincus, Gregory Goodwin (1903–1967)

Pinel, Philippe (1745–1826)

Pinker, Steven (1954– )

Piper, Charles V(ancouver) (1867–1926)

Pippard, (Alfred) Brian (1920–2008)

Pirie, Norman Wingate (1907–1997)

Pirogoff, Nikolai Ivanovich (1801–1881)

Pirquet, Clemens von (1874–1929)

Pirsson, Louis V(alentine) (1860–1919)

Pitt-Rivers, Augustus (1827–1900)

Pixii, Hippolyte (1808–1835)

Planck, Max Karl Ernst Ludwig (1858–1947)

Plaskett, John Stanley (1865–1941)

Plato (c. 420–340 BC)

Pliny, (Gaius Plinius Secundus) (AD 23–79)

Plücker, Julius (1801–1868)

Plunkett, Roy J (1910–1994)

Poincaré, (Jules) Henri (1854–1912)

Poiseuille, Jean-Louis(-Marie) (1799–1869)

Poisson, Siméon-Denis (1781–1840)

Polanyi, John Charles (1929– )

Polanyi, Michael (1891–1976)

Politzer, Hugh (David) (1949– )

Pólya, George (1887–1985)

Poncelet, Jean-Victor (1788–1867)

Pond, John (1767–1836)

Pons, Jean-Louis (1761–1831)

Pople, John Anthony (1925–2004)

Popov, Alexander Stepanovich (1859–1905)

Porsche, Ferdinand (1875–1951)

Porta, Giambattista della (c. 1541–1615)

Porter, George (1920–2002)

Porter, Keith R(oberts) (1912–1997)

Porter, Rodney Robert (1917–1985)

Posner, Michael I.

Post, Emil Leon (1897–1954)

Post, Richard F(reeman) (1918–2015)

Postel, Jon(athon) (1943–1998)

Pott, Percivall (1713–1788)

Poulsen, Valdemar (1869–1942)

Pound, Robert Vivian (1919–2010)

Powell, Cecil Frank (1903–1969)

Powell, John Wesley (1834–1902)

Poynting, John Henry (1852–1914)

Prandtl, Ludwig (1875–1953)

Pregl, Fritz (1869–1930)

Prelog, Vladimir (1906–1998)

Press, Frank (1924–2020)

Preston, Thomas (1860–1900)

Prévost, Pierre (1751–1839)

Pribram, Karl (1919–1973)

Priestley, Joseph (1733–1804)

Prigogine, Ilya (1917–2003)

Primakoff, Henry (1914–1983)

Pringsheim, Ernst (1859–1917)

Pringsheim, Nathaniel (1823–1894)

Pritchard, James Bennett (1909–1997)

Proctor, Bernard Emerson (1901–1959)

Prokhorov, Aleksandr Mikhailovich (1916–2002)

Proskouriakoff, Tatiana (Avenirovna) (1909–1985)

Proust, (Joseph) Louis (1754–1826)

Prout, William (1785–1850)

Prusiner, Stanley Ben (1942– )

Ptashne, Mark (1940– )

Ptolemy, (Claudius Ptolemaeus) (lived AD 2nd century)

Pullman, George Mortimer (1831–1897)

Pupin, Michael (Idvorsky) (1858–1935)

Purcell, Edward Mills (1912–1997)

Purkinje, Jan Evangelista (1787–1869)

Putnam, Frederic Ward (1839–1915)

Pye, John David (1932– )

Pyman, Frank Lee (1882–1944)

Pythagoras (lived c. 530 BC)