- Dabo-Niang, Sophie (Senegal/France, ?–?)
- Daboll, Nathan (USA, 1750–1818)
- Dabzac, Henry Joseph (Ireland, 1737–1790)
- de Dacia, Petrus (Denmark, ?–?)
- Dacorogna, Bernard (Switzerland, born 1953)
- Dade, Everett C. (USA, ?–?)
- Daemen, Joan (Belgium, born 1965)
- Dafermos, Constantine (Greece, born 1941)
- Dafermos, Mihalis (Greece, born 1976)
- Dahan, Amy (France, ?–?)
- Dahlin, Ernst Mauritz (Sweden, 1843–1929)
- Dahlquist, Germund (Sweden, 1925–2005)
- Dahmen, Wolfgang (Germany, born 1949)
- Dairoku, Kikuchi (Japan, 1855–1917)
- Dajani, Karma (Netherlands, ?–?)
- Dajczer, Marcos (Brazil, born 1948)
- Dakshayani, Bannihatti Parameshwarappa (India, ?–?)
- van Dalen, Dirk (Netherlands, born 1932)
- Dalibard, Anne-Laure (France, ?–?)
- Damek, Ewa (Poland, born 1958)
- Damgov, Vladimir (Bulgaria, 1947–2006)
- Damodara (Medieval India, ?–?)
- Dan, Nicușor (Romania, born 1969)
- Dana-Picard, Noah (France/Israel, born 1954)
- Dancer, Edward Norman (Australia, born 1946)
- Dandelin, Germinal Pierre (Belgium/Netherlands, 1794–1847)
- Dangicourt, Pierre (France, 1664–1727)
- Dani, Pallavi (?, ?–?)
- Dani, S. G. (India, born 1947)
- Daniel, Cuthbert (USA, 1904–1997)
- Danielewicz, Adam (Poland, 1846–1936)
- Daniell, Percy John (Britain, 1889–1946)
- Danielli, Donatella (Italy, born 1966)
- Daniels, Henry (Britain, 1912–2000)
- Danova, Sofia (Bulgaria, 1879–1946)
- Danti, Ignazio (Italy, 1536–1586)
- van Dantzig, David (Netherlands, 1900–1959)
- Dantzig, George (USA, 1914–2005)
- Dantzig, Tobias (USA, 1884–1956)
- Danzer, Ludwig (Germany, 1927–2011)
- Darafsheh, Mohammad Reza (Iran, born 1950)
- Darboux, Jean Gaston (France, 1842–1917)
- Darden, Christine (USA, born 1942)
- Darden, Geraldine Claudette (USA, born 1936)
- Daren, Huang (China, born 1945)
- Darley, George (Ireland, 1795–1846)
- Darmois, Georges (France, 1888–1960)
- Darmon, Henri (Canada, born 1965)
- Darwin, George (England, 1845–1912)
- Dasgupta, Samit (?, ?–?)
- Daskalopoulos, Panagiota (USA/Greece, ?–?)
- Dassios, George (Greece, born 1946)
- Dasypodius, Conrad (Switzerland, 1532–1600)
- Datta, Bibhutibhushan (India, 1888–1958)
- Daubechies, Ingrid (Belgium, born 1954)
- Dauben, Joseph (USA, born 1944)
- Dautray, Robert (France, born 1928)
- Davenport, Harold (Britain, 1907–1969)
- Davenport, William (scientist) (Ireland, 1772–1824)
- David, Chantal (Canada, born 1964)
- David, Florence Nightingale (England, 1909–1993)
- David, Guy (mathematician) (France, born 1957)
- Davidenko, Viktor (Soviet Union/Russia, 1914–1983)
- Davidoff, Giuliana (USA, ?–?)
- Davidoglu, Anton (Romania, 1876–1958)
- Davidov, August (Russia/Imperial Russia, 1823–1885)
- Davidson, Kenneth (Canada, born 1951)
- Davidson, Rollo (England, 1944–1970)
- Davie, Alexander Munro (?, born 1946)
- Davies, Alan (Britain, born 1945)
- Davies, E. Brian (Wales, born 1944)
- Davies, Evan Tom (Wales, 1904–1973)
- Davies, Penny J. (Scotland, ?–?)
- Davis, Anne-Christine (Britain, ?–?)
- Davis, Chandler (Canada, 1926–2022)
- Davis, Clive Selwyn (Australia, 1916–2009)
- Davis, Harold Thayer (USA, 1892–1974)
- Davis, Mark H. A. (England, 1945–2020)
- Davis, Martin (USA, 1928–2023)
- Davis, Philip J. (USA, 1923–2018)
- Davis, Robert B. (USA, 1926–1997)
- Dawei, Cheng (China, 1533–1606)
- Dawid, Philip (England, born 1946)
- Dawson Jr., John W. (?, born 1944)
- Dawson, Donald A. (Canada, born 1937)
- Dawson, Henry Gordon (Ireland, 1862–1918)
- Dawson, Jr, John W. (USA, born 1944)
- Day, Jeremiah (USA, 1773–1867)
- De Forest, Erastus L. (USA, 1834–1888)
- De Koninck, Jean-Marie (Canada, born 1949)
- De Lellis, Camillo (Italy, born 1976)
- De Loera, Jesús A. (USA/Mexico, born 1966)
- De Martino, Pietro (Italy, 1707–1746)
- De Mol, Christine (Belgium, born 1954)
- De Moortel, Ineke (Belgium/Scotland, ?–?)
- De Philippis, Guido (Italy, born 1985)
- De Silva, Daniela (Italy, ?–?)
- Deacon, Jeamie (?, born 1987)
- Deahna, Feodor (Germany, 1815–1844)
- Deakin, Michael A. B. (Australia, 1939–2014)
- Dean, William Reginald (England, 1896–1973)
- Deans, Winifred Margaret (England, 1901–1990)
- Death of Gareth Williams (Wales, 1978–2010)
- Debarre, Olivier (France, born 1959)
- Debnath, Lokenath (Britain, 1935–2023)
- Dechales, Claude (France, 1621–1678)
- Deconge, Mary (USA, born 1933)
- Dedecker, Paul (Belgium, 1921–2007)
- Dedekind, Richard (Germany, 1831–1916)
- Dee, John (England/Wales, 1527–1600s)
- Degayev, Sergey (USA, 1857–1921)
- Degen, Carl Ferdinand (Denmark, 1766–1825)
- DeGroot, Morris H. (USA, 1931–1989)
- Deheuvels, Paul (France, born 1948)
- Dehn, Max (Germany, 1878–1952)
- Dehornoy, Patrick (France, 1952–2019)
- Deidier, Antoine (France, 1670–1746)
- Deift, Percy (South Africa, born 1945)
- Deijfen, Maria (Sweden, born 1975)
- Dejter, Italo Jose (Argentina/USA, born 1939)
- Dekker, Theodorus (Netherlands, 1927–2021)
- Delahaye, Jean-Paul (France, born 1952)
- Delannoy, Henri (France, 1833–1915)
- Delaunay, Boris (Russia/Soviet Union, 1890–1980)
- Delavault, Huguette (France, 1924–2003)
- DeLaViña, Ermelinda (USA, ?–?)
- Delboeuf, Joseph (Belgium, 1831–1896)
- deLeeuw, Karel (USA, 1930–1978)
- Deliatitz, Nissan (Russia, ?–?)
- Deligne, Pierre (Belgium, born 1944)
- Delo, Ben (Britain, born 1984)
- Delsarte, Jean (France, 1903–1968)
- Demailly, Jean-Pierre (France, 1957–2022)
- DeMarco, Laura (USA, born 1974)
- Demazure, Michel (France, born 1937)
- Dembo, Amir (USA/Israel, born 1958)
- Dembski, William A. (USA, born 1960)
- Demetrius, Lloyd (USA, ?–?)
- Demidovich, Boris (Belarus, 1906–1977)
- Demisiani, Giovanni (Greece, ?–1614)
- Demmel, James (USA, born 1955)
- Democritus (Ancient Greece, 460s BC–370s BC)
- Dempster, Arthur P. (USA, born 1929)
- Dencker, Nils (Sweden, born 1953)
- Denef, Jan (Belgium, born 1951)
- von Denffer, Herbert (Germany, 1907–1988)
- Deninger, Christopher (Germany, born 1958)
- Denisov, Vasily (Russia, born 1951)
- Denjoy, Arnaud (France, 1884–1974)
- Dennis, Eddie (Wales, born 1986)
- Dennis, John E. (USA, born 1939)
- Dennis, Joseph (USA, 1905–1977)
- Dent, Beryl May (England, 1900–1977)
- Dentcheva, Darinka (Bulgaria, born 1958)
- Denvir, Cornelius (Ireland, 1791–1865)
- Deny, Jacques (France, 1916–2016)
- Deo, Narsingh (?, ?–?)
- Deodhar, Vinay V. (India, 1948–2015)
- Derman, Cyrus (USA, 1952–2011)
- Derman, Emanuel (South Africa, born 1940s)
- Dersch, Otto (Germany, born 1848)
- Deruyts, Jacques (Belgium, 1862–1945)
- Desargues, Girard (France, 1591–1661)
- Descartes, Blanche (England)
- Descartes, René (France, 1596–1650)
- Deshouillers, Jean-Marc (France, born 1946)
- Desrosières, Alain (France, 1940–2013)
- DeTurck, Dennis (USA, born 1954)
- Detweiler, Robert (USA, 1930–2003)
- Deuring, Max (Germany, 1907–1984)
- Deusing, Anton (Germany, 1612–1666)
- Deutsch, Frank (USA, born 1936)
- Develin, Mike (USA, born 1980)
- Devi, Shakuntala (India, 1929–2013)
- Devlin, Keith (Britain, born 1947)
- DeVore, Ronald (USA, born 1941)
- Dewar, Jacqueline (USA, ?–?)
- Dewdney, Alexander (Canada, born 1941)
- DeWitt-Morette, Cécile (France, 1922–2017)
- Dey, Tamal (USA/India, born 1964)
- Deza, Michel (Russia, 1939–2016)
- Dezani-Ciancaglini, Mariangiola (Italy, born 1946)
- Diaconis, Persi (USA, born 1945)
- Diacu, Florin (Canada, 1959–2018)
- Diamond, Fred (USA, born 1964)
- Díaz, Jesús Ildefonso (Spain, born 1950)
- Dicaearchus (Ancient Greece, 350s BC–280s BC)
- Dick, Auguste (Austria, 1910–1993)
- Dickenstein, Alicia (Argentina, born 1955)
- Dickson, James Douglas Hamilton (Scotland, 1849–1931)
- Dickson, Leonard Eugene (USA, 1874–1954)
- Dickstein, Samuel (Poland, 1851–1939)
- Dienes, Paul (Hungary, 1882–1952)
- Dienes, Zoltán Pál (Hungary, 1916–2014)
- Diestel, Joseph (USA, 1943–2017)
- Dietz, Ada (USA, 1882–1950)
- Dieudonné, Jean (France, 1906–1992)
- Dijksterhuis, Eduard Jan (Netherlands, 1892–1965)
- Dijkstra, Edsger W. (Netherlands, 1930–2002)
- Dillner, Göran (?, ?–?)
- Dilworth, Robert P. (USA, 1914–1993)
- Dimca, Alexandru (Romania, ?–?)
- Dinawari, Abu Hanifa (Medieval Persia, 820–896)
- Dines, Lloyd (Canada, 1885–1964)
- Dinger, Ulla (Sweden, born 1955)
- Dinghas, Alexander (Greece, 1908–1974)
- Dini, Ulisse (Italy, 1845–1918)
- Dinitz, Jeff (USA, born 1952)
- Dinneen, Michael (New Zealand, ?–?)
- Dinostratus (Ancient Greece, 390s BC–320s BC)
- Dinur, Irit (Israel, ?–?)
- Diocles (Ancient Greece, ?–?)
- Dionysodorus (Ancient Greece, 250s BC–190s BC)
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- Dirac, Gabriel Andrew (Hungary, 1925–1984)
- Dirac, Paul (England, 1902–1984)
- Ditchburn, Robert (Ireland, 1903–1987)
- Ditkin, Vitalii (Russia/Soviet Union, 1910–1987)
- Ditlevsen, Susanne (Denmark, ?–?)
- Divinsky, Nathan (Canada, 1925–2012)
- Diviš, Bohuslav (?, 1942–1976)
- Divjak, Blaženka (Croatia, born 1967)
- Dixmier, Jacques (France, born 1924)
- Dixon, Alfred Cardew (England, 1865–1936)
- Djrbashian, Mkhitar (Armenia/Soviet Union, 1918–1994)
- Dlab, Vlastimil (Czech Republic/Canada, born 1932)
- Dmitriyev, Mikhail Gennadiyevich (Russia/Soviet Union, ?–?)
- Dobrushin, Roland (Russia/Soviet Union, 1929–1995)
- Dobson, Annette (Australia, born 1945)
- Doby, Winston C. (USA, 1940–2014)
- Dod, Daniel (USA, 1788–1823)
- Dodds, Peter Sheridan (USA, ?–?)
- Dodge, William Hanson (USA, 1866–1932)
- Doeblin, Wolfgang (France/Germany, 1915–1940)
- Doering, Charles R. (USA, born 1956)
- Does, Ronald (Netherlands, born 1955)
- Doetsch, Gustav (Germany, 1892–1977)
- Dolbeault, Pierre (France, 1924–2015)
- Dolciani, Mary P. (USA, 1923–1985)
- Dold-Samplonius, Yvonne (Netherlands, 1937–2014)
- Dold, Albrecht (Germany, 1928–2011)
- Doléans-Dade, Catherine (France, 1942–2004)
- Dolgachev, Igor (Russia/Soviet Union, born 1944)
- Dolgopyat, Dmitry (Russia, born 1972)
- Dolidze, David (Soviet Union, born 1908)
- Domic, Antun (?, ?–?)
- Domínguez, Alberto González (Argentina, 1904–1982)
- Domínguez, Carmen (Spain, born 1969)
- Domninus of Larissa (Ancient Greece/Syria, 420–480)
- Domokos, Gábor (Hungary, born 1961)
- Donagi, Ron (USA, born 1956)
- Donaldson, John Dalgleish (Australia, born 1941)
- Donaldson, Simon (Britain, born 1957)
- Dongming, Wang (academic) (China, born 1961)
- Donnelly, Peter (Australia/England, born 1959)
- Donsker, Monroe D. (USA, 1924–1991)
- Doob, Joseph L. (USA, 1910–2004)
- van Doorninck, Damiaen Joan (Netherlands, 1902–1987)
- Doppler, Christian (Austria, 1803–1853)
- Doran, Robert S. (USA, born 1937)
- Dorgelo, Henk (Netherlands, 1894–1961)
- Dória, Francisco (Brazil, born 1945)
- Doty, Stephen (USA, born 1953)
- Doty, Stephen R. (?, born 1953)
- Douady, Adrien (France, 1935–2006)
- Dougall, John (Scotland, 1867–1960)
- Dougherty, Randall (USA, born 1961)
- Douglas, Jesse (USA, 1897–1965)
- Douglas, Ronald G. (USA, 1938–2018)
- van Douwen, Eric (Netherlands, 1946–1987)
- Dowker, Clifford Hugh (Canada, 1912–1982)
- Dowker, Yael (Israel, 1919–2016)
- Downey, Rod (Australia/New Zealand, born 1957)
- Doxiadis, Apostolos (Greece, born 1953)
- Drach, Jules (France, 1871–1949)
- Dragović, Vladimir (Serbia, born 1967)
- Dranishnikov, Alexander (USA, born 1958)
- Dray, Tevian (USA, born 1956)
- Drazin, Michael P. (USA, ?–?)
- Dresden, Arnold (Netherlands, 1882–1954)
- Dresher, Melvin (USA, 1911–1992)
- Dress, Andreas (Germany, born 1938)
- van den Dries, Lou (Netherlands, born 1951)
- van den Driessche, Pauline (Britain/Canada, born 1941)
- Drinfeld, Vladimir (Soviet Union/Ukraine, born 1954)
- Driscoll, Agnes Meyer (USA, 1889–1971)
- Driver, Rod (USA, 1932–2022)
- Drmota, Michael (Austria, born 1964)
- Drobisch, Moritz Wilhelm (Germany, 1802–1896)
- Droz-Farny, Arnold (Switzerland, 1856–1912)
- Drozd, Yuriy (Ukraine, born 1944)
- Drury, Stephen (mathematician) (Britain/Canada, ?–?)
- Druțu, Cornelia (Romania, ?–?)
- Drysdale, David (Scotland, 1877–1946)
- Du, Qiang (China, ?–?)
- Duan, Naihua (Taiwan, born 1949)
- Dubiel, Malgorzata (Poland/Canada, ?–?)
- Dubins, Lester (USA, 1920–2010)
- Dubner, Harvey (USA, ?–?)
- Dubois, Didier (France, born 1952)
- Dubreil-Jacotin, Marie-Louise (France, 1905–1972)
- Dubreil, Paul (France, 1904–1994)
- Dubrovin, Boris (Soviet Union/Russia, 1950–2019)
- Duchin, Moon (USA, ?–?)
- Dudeney, Henry (England, 1857–1930)
- Dudley, Richard M. (USA, 1938–2020)
- Dudley, Underwood (USA, born 1937)
- Duff, George F. D. (Canada, 1926–2001)
- Duff, Iain S. (Britain, born 1947)
- Duffus, Dwight (Canada, ?–?)
- Duflo, Michel (France, born 1943)
- Dugué, Daniel (France, 1912–1987)
- Dugundji, James (USA, 1919–1985)
- de Duillier, Nicolas Fatio (?, 1664–1753)
- Duistermaat, Hans (Netherlands, 1942–2010)
- Dujella, Andrej (Croatia, born 1966)
- Dujmović, Vida (Canada, born 1972)
- Duke, William (USA, born 1958)
- Dukic, Vanja (USA, ?–?)
- Dulac, Henri (France, 1870–1955)
- Dumas, Gustave (Switzerland, 1872–1955)
- Dumbleton, John (?, ?–?)
- Duminil-Copin, Hugo (France, born 1985)
- Dumitriu, Ioana (Romania, born 1976)
- Duncan, Acheson J. (USA, 1904–1995)
- Duncan, Ernest (USA, 1916–1990)
- Dundas, William John (Scotland, 1849–1921)
- Dunfield, Nathan (USA, born 1975)
- Dunford, Nelson (USA, 1906–1986)
- Dunham, William (USA, born 1947)
- Dunkl, Charles F. (USA, born 1941)
- Dunn, Olive Jean (USA, 1915–2008)
- Dunnett, Charles (Canada, 1921–2007)
- Dunnington, G. Waldo (USA, 1906–1974)
- Dunwoody, Martin (Britain, born 1938)
- Dupin, Charles (France, 1784–1873)
- Dupire, Bruno (?, ?–?)
- Dupré, Athanase (France, 1808–1869)
- Durant, Henry William (Britain, 1902–1984)
- Durell, C. V. (England, 1955–1968)
- Duren, Peter (USA, 1935–2020)
- Durfee, William Pitt (USA, 1855–1941)
- Durov, Nikolai (Russia, born 1980)
- Durrett, Rick (USA, ?–?)
- Dusart, Pierre (France, ?–?)
- Dutta, Chitra (India, ?–?)
- Dvivedi, Sudhakara (India, 1855–1910)
- Dvořák, Zdeněk (Czech Republic, born 1981)
- Dvoretzky, Aryeh (Israel, 1916–2008)
- Dwass, Meyer (USA, 1923–1996)
- Dwork, Bernard (USA, 1923–1998)
- Dwyer, William Gerard (USA, born 1947)
- Dyakonov, Alexander (Russia, born 1979)
- Dyakonov, Yevgeny (Russia/Soviet Union, 1935–2006)
- Dybvad, Christoffer (Denmark, 1578–1622)
- Dybvad, Jørgen (Denmark, ?–1612)
- von Dyck, Walther (Germany, 1856–1934)
- Dye, Henry (USA, 1926–1986)
- Dym, Harry (Israel, born 1938)
- Dyn, Nira (Israel, ?–?)
- Dynin, Alexander (Russia/Soviet Union, ?–?)
- Dynkin, Eugene (USA/Soviet Union/Russia, 1924–2014)
- Dyson, Freeman (England/USA, 1923–2020)
- Dysthe, Kristian B. (Norway, 1937–2023)
- Dyusembaev, Anuar (Kazakhstan, born 1953)
- Dzhumadildayev, Askar (Kazakhstan, born 1956)
- Dzhun, Joseph (Ukraine, born 1940)
- Dzițac, Ioan (Romania, 1953–2021)
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