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Arogyaswami Paulraj (born 1944), India/USA – MIMO
Antonio Pacinotti (1841–1912), Italy – Pacinotti dynamo
Larry Page (born 1973), USA – with Sergey Brin invented Google web search engine
William Painter (1838–1906), UK/USA – a.o. Crown cork, Bottle opener
Alexey Pajitnov (born 1956), Russia/USA – Tetris
Julio Palmaz (born 1945), Argentina – balloon-expandable, stent
Helge Palmcrantz (1842–1880), Sweden – the multi-barrel, lever-actuated, machine gun
Daniel David Palmer (1845–1913), Canada – chiropractic
Luigi Palmieri (1807–1896), Italy – seismometer
Frank Pantridge (1916–2004), Ireland – Portable defibrillator
Georgios Papanikolaou (1883–1962), Greece / USA – Papanicolaou stain, Pap test = Pap smear
Philip M. Parker (born 1960), USA – computer automated book authoring
Alexander Parkes (1831–1890), UK – celluloid
Forrest Parry (1921–2005), USA – Magnetic stripe card
Charles Algernon Parsons (1854–1931), British – steam turbine
Spede Pasanen (1930–2001), Finland – a.o. ski jumping sling, boat ski
Blaise Pascal (1623–1662), France – Pascal's calculator
Gustaf Erik Pasch (1788–1862), Sweden – safety match
Dimitar Paskov (1914–1986), Bulgaria – Galantamine
C. Kumar N. Patel (born 1938), India/USA – Carbon dioxide laser
Les Paul (1915–2009), USA – multitrack recording
Andreas Pavel (born 1945), Brazil – các thiết bị âm thanh
Ivan Pavlov (1849–1936), Russia, – classical conditioning
Floyd Paxton (1918–1975), USA – a.o. Bread clip
John Pemberton (1831–1888), USA – Coca-Cola
Slavoljub Eduard Penkala (1871–1922), Croatia – mechanical pencil
William Henry Perkin (1838–1907), United Kingdom – first synthetic organic chemical dye Mauveine
Henry Perky (1843–1906), USA – shredded wheat
Alfred Perot (1863–1925), together with Charles Fabry (1867–1945), France – Fabry–Pérot interferometer (physics)
Stephen Perry, UK (fl. 19th century) – rubber band
Aurel Persu (1890–1977), Romania – first aerodynamic car, aluminum body with wheels included under the body, 1922
Vladimir Petlyakov (1891–1942), Russia – heavy bomber
Julius Richard Petri (1852–1921), Germany – đĩa Petri
Peter Petroff (1919–2004), Bulgaria – digital wrist watch, heart monitor, weather instruments
Fritz Pfleumer (1881–1945), Germany – magnetic tape
Auguste Piccard (1884–1962), Switzerland – Bathyscaphe
Gregory Goodwin Pincus (1903–1967), together with Min Chueh Chang (1908–1991), USA/China – Combined oral contraceptive pill
Nikolay Ivanovich Pirogov (1810–1881), Russia – early use of ether as anaesthetic, first anaesthesia in a field operation, various kinds of surgical operations
Fyodor Pirotsky (1845–1898), Russia – electric tram
Arthur Pitney (1871–1933), United States – postage meter
Hippolyte Pixii (1808–1835), France – Pixii dynamo
Joseph Plateau (1801–1883), Belgium – phenakistiscope (stroboscope)
Baltzar von Platen (1898–1984), Sweden – gas absorption refrigerator
James Leonard Plimpton (1828–1911), USA – roller skates
Ivan Plotnikov (1902–1995), Russia – kirza leather
Roy Plunkett (1910–1994), United States – Teflon
Petrache Poenaru (1799–1875), Romania – fountain pen
Christopher Polhem (1661–1751), Sweden – the modern padlock
Nikolai Polikarpov (1892–1944), Russia – Po-series aircraft, including Polikarpov Po-2 Kukuruznik (world's most produced biplane)
Eugene Polley (1915–2012), United States – wireless remote control (with Robert Adler)
Ivan Polzunov (1728–1766), Russia – first two-cylinder steam engine
Mikhail Pomortsev (1851–1916), Russia – nephoscope
Olivia Poole (1889–1975), USA, – the Jolly Jumper baby harness
Alexander Popov (1859–1906), Russia – radio pioneer, created a radio receiver that worked as a lightning detector
Nikolay Popov (1931–2008), Russia – first fully gas turbine main battle tank (T-80)
Josef Popper (1838-1921), Austria- discovered the transmission of power by electricity.
Aleksandr Porokhovschikov (1892–1941), Russia – Vezdekhod (the first prototype tank, or tankette, and the first caterpillar amphibious ATV)
Ignazio Porro (1801–1875), Italy – Porro prism, Strip camera
Valdemar Poulsen (1869–1942), Denmark – magnetic wire recorder, arc converter
Joseph Priestley (1733–1804), UK – nước soda
Alexander Procofieff de Seversky (1894–1974), Russia/United States of America – first gyroscopically stabilized bombsight, ionocraft, also developed air-to-air refueling
Alexander Prokhorov (1916–2002), Russia – co-inventor of laser and maser
Petro Prokopovych (1775–1850), Russian Empire – early beehive frame, queen excluder and other beekeeping novelties
Sergey Prokudin-Gorsky (1863–1944), Russia/France – early colour photography method based on three colour channels, also colour film slides and colour motion pictures
Mark Publicover (born 1958), USA – First affordable trampoline safety net enclosure
George Pullman (1831–1897), USA – Pullman sleep wagon
Michael I. Pupin (1858–1935), Serbia – pupinization (loading coils), tunable oscillator
Tivadar Puskas (1844–1893), Hungary – telephone exchange