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- I, Bhāskara (Medieval India, ?–?)
- Iacob, Caius (Romania, 1912–1992)
- Iamblichus (?, 245–325)
- Ibe, Milagros D. (?, born 1931)
- Ibidapo-Obe, Oyewusi (Nigeria, born 1951)
- Ibragimov, Nail H. (Russia, ?–?)
- ibn Ibrāhīm al-Fazārī, Muḥammad (Medieval Arabia/Medieval Persia/Medieval Iraq, ?–?)
- ibn Ibrahim al-Umawi, Ya'ish (Medieval Arabia/Medieval Syria, 1400–1489)
- Ibrahimov, Vagif Rza (Azerbaijan, ?–?)
- Ifrah, Georges (France, born 1947)
- Ignatova, Mihaela (Bulgaria, ?–?)
- Igusa, Jun-Ichi (Japan, 1924–2013)
- Igusa, Kiyoshi (?, born 1949)
- Ihaka, Ross (New Zealand, ?–?)
- Ihara, Yasutaka (Japan, born 1938)
- II, Aegidius Strauch (Germany, 1632–1682)
- II, Aryabhata (Medieval India/Ancient India, 920s–1000s)
- II, Bhāskara (Medieval India, 1114–1185)
- II, Jai Singh (India, 1688–1743)
- II, James Waddell Alexander (USA, 1888–1971)
- II, Pope Sylvester (Medieval France, 940s–1003)
- III, Berrien Moore (USA, ?–?)
- III, Ernest S. Croot (USA, ?–?)
- III, Hugh Everett (USA, 1930–1982)
- III, William Hamilton Meeks (?, born 1947)
- Iitaka, Shigeru (Japan, born 1942)
- Ikeda, Masatoshi Gündüz (Turkey, 1926–2003)
- Ikehara, Shikao (Japan, 1904–1984)
- Illusie, Luc (France, born 1940)
- Ilolov, Mamadsho (Soviet Union, born 1948)
- Ilyashenko, Yulij (Soviet Union/Russia, born 1943)
- Ilyin, Alexander (mathematician) (Russia, born 1973)
- Imafidon, Anne-Marie (?, ?–?)
- Imai, Hideki (?, born 1943)
- Iman, Ronald L. (USA, ?–?)
- Imastaser, Hovhannes (Armenia, ?–?)
- Imhausen, Annette (Germany, born 1970)
- Imízcoz, María Teresa Lozano (Spain, born 1946)
- Impagliazzo, Russell (USA, ?–?)
- Imrich, Wilfried (Austria, ?–?)
- Inaudi, Jacques (Italy, 1867–1950)
- Ince, Edward Lindsay (England, 1891–1941)
- Ingham, Albert (England, 1900–1967)
- Ingleton, Aubrey William (England, 1920–2000)
- Ingram, John Kells (Ireland, 1823–1907)
- Inman, James (Britain, 1776–1859)
- Inselberg, Alfred (USA, ?–?)
- instructor, C. L. E. Moore (?, ?–?)
- Insua, David Ríos (Spain, born 1964)
- Interpretation of Dreams (Antiphon) (Ancient Greece, ?–?)
- Inzinger, Rudolf (?, 1907–1980)
- Ioana, Adrian (Romania, born 1981)
- Ioffe, Dmitry (Israel, 1963–2020)
- Ion, Patrick (USA, ?–?)
- Ionel, Eleny (Romania, ?–?)
- Ionescu-Tulcea, Cassius (?, born 1923)
- Ionescu, Nae (Romania, 1890–1940)
- Iooss, Gérard (?, born 1944)
- Ioviță, Adrian (?, born 1954)
- Ipsen, Ilse (Germany, ?–?)
- Iranshahri (Persia, ?–?)
- Iribarren, Gonzalo Pérez (Uruguay, 1936–1998)
- Irons, Bruce (?, 1924–1983)
- Irwin, Joseph Oscar (Britain, 1898–1982)
- Isaac, Earl (?, 1921–1983)
- Isaacs, Martin (USA, ?–?)
- Isaacs, Rufus (?, 1914–1981)
- Isaacson, Eugene (?, 1919–2009)
- Isakhanli, Hamlet (Azerbaijan/Soviet Union, born 1948)
- Isakov, Victor (?, born 1947)
- Isbell, John R. (USA, 1930–2005)
- Isenkrahe, Caspar (Germany, 1844–1921)
- Iserles, Arieh (?, born 1947)
- Al-Isfahani (Medieval Persia, ?–?)
- Al-Isfizari (Medieval Persia, ?–1087)
- Isham, Valerie (Britain, born 1947)
- ibn Ishaq, Hunayn (Medieval Arabia/Medieval Iraq, 809–873)
- Ishii, Shihoko (Japan, ?–?)
- Ishikawa, Kaoru (Japan, 1915–1989)
- Isidore of Miletus (?, ?–?)
- Isidore of Seville (?, 560–636)
- Iskovskikh, Vasilii (?, 1939–2009)
- science in medieval Islam, Hindu and Buddhist contribution to (?, ?–?)
- Islam, Jamal Nazrul (?, 1939–2013)
- Ismail-Zadeh, Alik (Azerbaijan, born 1961)
- Ismail, Mourad (USA, born 1944)
- Ismailov, Aleksey (Russia, ?–?)
- Isserlis, Leon (Ukraine/Britain, 1881–1966)
- Itô, Kiyosi (Japan, 1915–2008)
- Itō, Shuntarō (?, born 1930)
- Its, Alexander (USA, ?–?)
- Iusem, Alfredo Noel (Brazil, born 1949)
- Ivakhnenko, Alexey (Ukraine/Soviet Union, 1913–2007)
- Ivanov, Ivan (Imperial Russia/Soviet Union, 1862–1939)
- Ivanov, Lyubomir (Bulgaria, born 1952)
- Ivanov, Nikolai (mathematician) (Soviet Union, born 1954)
- Ivanov, Sergei (mathematician) (?, born 1972)
- Iversen, Felix (Finland, 1887–1973)
- Ivory, James (Scotland, 1765–1842)
- Ivrii, Victor (Canada, born 1949)
- Iwahori, Nagayoshi (Japan, ?–2011)
- Iwaniec, Henryk (Poland, born 1947)
- Iwaniec, Tadeusz (Poland/USA, born 1947)
- Iwasawa, Kenkichi (Japan, 1917–1998)
- Iyanaga, Shokichi (Japan, 1906–2006)
- Iyengar, C. N. S. (India, ?–1972)
- Iyengar, Vanaja (India, ?–2001)
- Izhboldin, Oleg (Russia, 1963–2000)
- Izsák, Imre (Hungary, 1929–1965)