Wikipedia:WikiProject Mathematics/List of mathematicians (O)

• O'Brien, Matthew (Ireland, 1814–1855)
• O'Connell, Neil (Ireland, ?–?)
• O'Dorney, Evan (USA, born 1993)
• O'Hara, Jun (Japan, born 1963)
• O'Keefe, Christine (Australia, ?–?)
• O'Leary, Dianne P. (?, born 1951)
• O'Malley, Robert Edmund (USA, born 1939)
• O'Meara, O. Timothy (USA, 1928–2018)
• O'Nan, Michael (USA, 1943–2017)
• O'Neill, Barrett (USA, 1924–2011)
• O'Shea, Donal (Canada, ?–?)
• Obádovics, Gyula J. (Hungary, born 1927)
• Oberschelp, Arnold (Germany, 1932–2024)
• Obi, Chike (Nigeria, 1921–2008)
• Obreshkov, Nikola (Bulgaria, 1896–1963)
• d'Ocagne, Philbert Maurice (France, 1862–1938)
• Ockendon, Hilary (Britain, ?–?)
• Ockendon, John (Britain, born 1940s)
• Ocone, Daniel (USA, ?–?)
• Oda, Tadao (Japan, born 1940)
• Oddi, Muzio (Italy, 1569–1639)
• Odlyzko, Andrew (USA, born 1949)
• Oellermann, Ortrud (Canada/South Africa, ?–?)
• Oenopides (Ancient Greece, born 490s BC)
• Oesterlé, Joseph (France, born 1954)
• Offord, Cyril (?, 1906–2000)
• Ofman, Yuri Petrovich (Russia, born 1939)
• Ogden, Raymond (Britain, ?–?)
• Ogg, Andrew (USA, born 1934)
• Oggier, Frédérique (Switzerland/Singapore, ?–?)

• Ogilvy, C. Stanley (USA, 1913–2000)
• Ognjanović, Srđan (Serbia, ?–?)
• Ogura, Kinnosuke (Japan, ?–?)
• Ogus, Arthur (USA, ?–?)
• Oh, Hee (South Korea, born 1969)
• Oh, Yong-Geun (South Korea, born 1961)
• Ohm, Martin (Germany, 1792–1872)
• Ohya, Masanori (Japan, born 1947)
• Oja, Eve (Estonia, ?–?)
• Oka, Kiyoshi (Japan, 1901–1978)
• Okamoto, Hisashi (?, born 1956)
• Okamura, Hiroshi (Japan, 1905–1948)
• Okikiolu, Kathleen Adebola (Britain, born 1965)
• Okounkov, Andrei (Russia, born 1969)
• Øksendal, Bernt (Norway, born 1945)
• Oldroyd, James G. (Britain, 1921–1982)
• Olds, Carl D. (New Zealand, 1912–1979)
• Olearius, Adam (Germany, 1603–1671)
• Olech, Czesław (Poland, 1931–2015)
• Oleinik, Olga (Soviet Union, 1925–2001)
• Olesen, Dorte (Denmark, born 1948)
• Olevskii, Alexander Moiseevich (Soviet Union/Israel, born 1939)
• Olive, David (?, 1937–2012)
• Olive, Gloria (New Zealand, 1923–2006)
• de Oliveira, Adriana Neumann (Brazil, ?–?)
• Olivier, Théodore (?, 1793–1853)
• Oliynyk, Todd (Australia, ?–?)
• Olkin, Ingram (USA, 1924–2016)
• Ollerenshaw, Kathleen (Britain, 1912–2014)
• Olney, Grant (USA, born 1983)
• Olshansky, Aleksandr (Soviet Union/Russia, born 1946)

• Olubummo, Adegoke (Nigeria, ?–?)
• Olubummo, Yewande (Nigeria, ?–?)
• Olum, Paul (USA, 1918–2001)
• Olunloyo, Victor Omololu (Nigeria, born 1935)
• Olver, Frank W. J. (USA, 1924–2013)
• Olver, Peter J. (USA, born 1952)
• Onicescu, Octav (Romania, 1892–1983)
• Onishchik, Arkady Lvovich (Russia, 1933–2019)
• Ono, Ken (USA, born 1968)
• Ono, Takashi (?, born 1928)
• Onumanyi, Peter (Nigeria, ?–?)
• Onuş, Melih (Turkey, ?–?)
• Oommen, John (India, born 1953)
• Oort, Frans (?, born 1935)
• Opelt, Friedrich Wilhelm (Germany, 1794–1863)
• Oppenheim, Alexander (Britain, 1903–1997)
• Oppermann, Ludvig (Denmark, 1817–1883)
• Oppitz, Volker (Germany, born 1931)
• von Oppolzer, Theodor (Austria, 1841–1886)
• Ore, Øystein (Norway, 1899–1968)
• Oren, Menachem (Israel, 1903–1962)
• Oresme, Nicole (Medieval France, 1320s–1382)
• Orlando, Luciano (Italy, 1887–1915)
• Orlicz, Władysław (Poland, 1903–1990)
• Orlik, Peter (?, born 1938)
• Orlov, Dmitri Olegovich (Soviet Union, born 1966)
• Orno, Peter (USA, ?–?)
• Ornstein, Donald Samuel (USA, born 1934)
• Ornstein, Leonard (?, 1880–1941)
• Orr, William McFadden (Ireland, 1866–1934)
• Orrell, David (Canada, born 1962)

• Orshansky, Mollie (?, 1915–2006)
• Orszag, Steven (USA, 1943–2011)
• de Ortega, Juan (mathematician) (Spain, ?–?)
• Ortlieb, Claus Peter (?, 1947–2019)
• Osborn, John E. (USA, 1936–2011)
• Osgood, William Fogg (USA, 1864–1943)
• Osher, Stanley (USA, born 1942)
• Osin, Denis (?, ?–?)
• Osinga, Hinke (Netherlands/New Zealand, born 1969)
• Osipov, Yury (Russia/Soviet Union, born 1936)
• Osipovsky, Timofei (Russia, 1766–1832)
• Osofsky, Barbara L. (?, ?–?)
• Osserman, Robert (USA, 1926–2011)
• Ossiander, Mina (?, ?–?)
• Ossona de Mendez, Patrice (France, born 1966)
• Osterwalder, Konrad (Switzerland, born 1942)
• Osthus, Deryk (?, ?–?)
• Ostrogradsky, Mikhail (Ukraine/Imperial Russia, 1801–1862)
• Ostrovskii, Iossif (Soviet Union, 1934–2020)
• Ostrowski, Alexander (Ukraine, 1893–1986)
• Otho, Valentinus (Germany, ?–1603)
• Ott, Edward (?, ?–?)
• D'Ottaviano, Itala (Brazil, born 1944)
• Ottlik, Géza (Hungary, 1912–1990)
• Otto, Felix (Germany, born 1966)
• van Oudenaarden, Alexander (?, born 1970)
• Ouedraogo, Marie Françoise (?, born 1967)
• Oughtred, William (England, 1575–1660)
• Oum, Sang-il (South Korea, born 1976)
• Overbeek, Ross (USA, born 1949)

• D'Ovidio, Enrico (?, ?–?)
• Owen, Guillermo (Colombia, born 1938)
• Owen, Henry (Wales, 1716–1795)
• Owens, Helen Brewster (?, 1881–1968)
• Owens, Robyn (Australia, ?–?)
• Oxley, James (Australia, ?–?)
• Oxtoby, John C. (?, 1910–1991)
• Oystaeyen, Fred Van (Belgium, born 1947)
• Ozanam, Jacques (France, 1640–1718)
• Ozawa, Narutaka (?, born 1974)
• Ozsváth, Peter (Hungary, born 1967)

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