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- al-Qadi, Ahmad Ibn (Morocco, 1552–1616)
- Qadir, Asghar (Pakistan, born 1946)
- Al-Qalqashandi (?, 1350s–1418)
- Qinglai, Xiong (China, 1893–1969)
- Quade, Edward Schaumberg (USA, born 1988)
- Quarteroni, Alfio (Italy/Switzerland, born 1952)
- Quastel, Jeremy (Canada, ?–?)
- Queffélec, Martine (France, born 1949)
- de Queiroz, Ruy (Brazil, born 1958)
- de Quesada, Cristoforo Alasia (?, 1864–1918)
- Quetelet, Adolphe (Belgium, 1796–1874)
- Quevedo, Fernando (?, ?–?)
- al-Qūhī, Abū Sahl (Medieval Persia/Medieval Iraq, 940–1000)
- Quillen, Daniel (USA, 1940–2011)
- Quine, Willard Van Orman (USA, 1908–2000)
- Quinn, Frank (USA, born 1946)
- Quint, Jean-François (?, ?–?)
- Quinton, Anthony (?, 1925–2010)
- ibn Qurra, Thābit (Medieval Arabia/Medieval Iraq/Medieval Syria, 826–901)
- Qushji, Ali (Turkey/Medieval Persia, 1403–1474)