Paget,
James Palade,
George E. Paracelsus Paré,
Ambroise Parkinson,
James Pasteur,
Louis Pavlov,
Ivan Petrovich Pelletier,
Pierre-Joseph Penrose,
Lionel Sharples Pincus,
Gregory Goodwin Pirquet,
Clemens, Baron (Freiherr) von Poiseuille,
Jean Léonard Marie Porter,
Rodney Robert Prelog,
Vladimir Prusiner,
Stanley B. Purkinje,
Jan Evangelista Pyman,
Frank Lee