Important scientists

 

O

 Severo Ochoa (1905 - 1993)  biochemist  DNA replication, enzyme chemistry (with Kornberg)

 Georg Ohm

(1787 - 1854)  physicist  electric current, Ohm's Law
 George Olah (1927 - )  chemist  carbocations, superacids
 Mark Oliphant (1901 - 2000)  physicist  discovered nuclei of helium-3 and tritium, airborne radar

 Heike Onnes

(1853 - 1926)  physicist  discovered superconductivity
 Lars Onsager (1903 - 1976)  physicist  statistical mechanics, Onsager reciprocal relations, temperature gradients

 Robert Oppenheimer

(1904 - 1967)  physicist  leader of atom bomb (Manhattan) project
 Douglas Osheroff (1945 - )  physicist  superfluidity in helium-3 (with Lee, Richardson)
 Wilhelm Ostwald (1853 - 1922)  chemist  catalysis, chemical equilibrium, reaction rate

 Nikolaus Otto

(1832 - 1891)  engineer  inventor of 4-stroke internal combustion engine (see Lenoir)