In bold, the official abbreviations
- Jaanusson, V Valdar Jaanusson
- Jaap, O (Jaap) Otto Jaap (1864–1922)
- Jaaska, V (Jaaska) Vello Jaaska
- Jabouille, P Pierre Jabouille
- Jaccard, H (Jaccard) Henri Jaccard (1844–1922)
- Jäch, MA Manfred A. Jäch
- Jack, W (Jack) William Jack (1795–1822)
- Jäckh, E Eberhard Jäckh (1902–1993)
- Jackman, TR Todd R. Jackman
- Jackson, AB (A.B.Jacks.) Albert Bruce Jackson (1876–1947)
- Jackson, AK (A.K.Jacks.) Arthur Keith Jackson (1914– )
- Jackson, BD (B.D.Jacks.) Benjamin Daydon Jackson (1846–1927)
- Jackson, FM Frederick John Jackson (1859–1929)
- Jackson, G (Jacks.) George Jackson (1790–1811)
- Jackson, HS (H.S.Jacks.) Herbert Spencer Jackson (1883–1951)
- Jackson, KL Keith L. Jackson
- Jackson, M Mary Jackson
- Jackson, PBN Peter B. N. Jackson
- Jackson, PJ (P.J.Jacks.) P.J. Jackson (fl. 1981–89)
- Jackson, RC (R.C.Jacks.) Raymond Carl Jackson (1928–2008)
- Jacobi, GA Georg Albano von Jacobi (1805–1874)
- Jacobi, JD James D. Jacobi
- Jacob-Makoy, L Lambert Jacob-Makoy (1790–1873)
- Jacobs, HJ Hans J. Jacobs
- Jacobs, H-J Hans-Joachim Jacobs
- Jacobs, J-C Jean-Charles Jacobs
- Jacobs, M (M.Jacobs) Marius Jacobs (1929–1983)
- Jacobs, SWL (S.W.L.Jacobs) Surrey Wilfrid Laurance Jacobs (1946– )
- Jacobsen, H (H.Jacobsen) Hermann Johannes Heinrich Jacobsen (1898–1978)
- Jacobsen, H (Jacobsen) Hans Jacobsen (1815–1891)
- Jacobsen, N (N.Jacobsen) Niels Henning Günther Jacobsen (1941– )
- Jacobson, AJ (A.J.Jacobson) Amanda J. Jacobson
- Jacobson, GG Georgiy Georgievich Jacobson (1871–1926)
- Jacobus, LM (Jocobus) Luke M.Jacobus
- Jacoby, M Martin Jacoby (1842–1907)
- Jácome, M Marco Jácome
- Jacot, AP Arthur P. Jacot
- Jacquelin du Val, PNC (Jacquelin du Val) Pierre Nicolas Camille Jacquelin du Val (1828–1862)
- Jacquemart, A Albert Jacquemart (1808-1875)
- Jacquemart, S Serge Jacquemart (1926–1980)
- Jacquemont, VV (Jacquem.) Venceslas Victor Jacquemont (1801–1832)
- Jacques, HA (Jacques) Henri Antoine Jacques (1782–1866)
- Jacques-Félix, H (Jacq.-Fél.) Henri Jacques-Félix (1907–2008)
- Jacquet, P Pierre Jacquet
- Jacquin, JF (J.Jacq.) Joseph Franz von Jacquin (1766–1839)
- Jacquin, NJ (Jacq.) Nicolaus Joseph von Jacquin (1727–1817)
- Jacquinot, CH Charles Hector Jacquinot (1796–1879)
- Jacquinot, H Honoré Jacquinot (1815–1887)
- Jaczewski, ALA de (Jacz.) Artur Arturovich Jaczewski (1863–1932)
- Jadwiszczak, AS Andrzej S. Jadwiszczak
- Jaeger, A (A.Jaeger) August Jaeger (1842–1877)
- Jaeger, GF Georg Friedrich Jaeger (1785–1866)
- Jaeger, J-J Jean-Jacques Jaeger
- Jäger, P Peter Jäger
- Jaeger, PML (P.-M.L.Jaeger) Peter-Martin Lind Jaeger (1950– )
- Jaeger, WF Wilhelm Friedrich Jaeger (1812–1834)
- Jaekel, O Otto Jaekel (1863–1929)
- Jaenicke, B (Jaenicke) Birgit Jaenicke
- Jafari, A (Jafari) Azarnoosh Jafari (fl. 2008)
- Jafri, SMH (Jafri) Saiyad Masudal Hasan Jafri (1927–1986)
- Jagadeesh Ram, TAM (Jagadeesh Ram) T.A.M. Jagadeesh Ram
- Jago, ND Nicholas David Jago (1936–2005)
- Jahandiez, E (Jahand.) Émile Jahandiez (1876–1938)
- Jahn, AE Alex E. Jahn
- Jahn, R. (R.L.Jahn) Ralf Jahn (1961– )
- Jahyny, BJB Benoit Jean Bernard Jahyny
- Jain, SK Sudhanshu Kumar Jain (1926– )
- Jain, SL Sohan Lall Jain
- Jain, SP Shreeyansh Prasad Jain (1937– )
- Jaitrong, W Weeyawat Jaitrong
- Jakely, D (Jakely) Dietmar Jakely
- Jakob, H Hermann Jakob
- Jakosalem, PGC Philip Godfrey Cosep Jakosalem
- Jakowlew, AI Alexander Iwanowitsch Jakowlew (1863–1909)
- Jakubziner, MM (Jakubz.) Moisej Markovich Jakubziner (1898–1979)
- Jakusch, J (Jakusch) Jens Jakusch
- Jakutowicz, M.B. Mariola B. Jakutowicz
- Jalava, J (Jalava) Jukka Jalava
- Jaloszynski, P (Jaloszynski) Pawel Jaloszynski
- James, CW (C.W.James) Charles William James (1929– )
- James, EP (E.James) Edwin P. James (1797–1861)
- James, PW (P.James) Peter Wilfred James (1930– )
- James, SW (S.W. James) Samuel W. James
- James, TP Thomas Potts James (1803–1882)
- James, TY (T.Y.James) Timothy Y. James
- Jameson, DL David L. Jameson
- Jameson, ML Mary Liz Jameson
- Jameson, R Robert Jameson (1774–1854)
- Jan, G (Jan) Giorgio Jan (1791–1866)
- Janák, J Jiří Janák
- Janakidevi, K (Janakid.) Kilambi Janakidevi (19..– )
- Janarthanam, MK (Janarth.) Malapati Kuppuswamy Janarthanam (1960– )
- Janchen, EEA (Janch.) Erwin Emil Alfred Janchen (1882–1970)
- Janczewski, E (Jancz.) Eduard von Glinka Janczewski (1846–1918)
- Janensch, W Werner Janensch (1878–1969)
- Jang, SS Spencer S. Jang
- Janicki, C (Janicki) Konstanty Janicki (1876–1932)
- Janicki, T (T.Janicki) Taras Janicki (19..–)
- Janischewsky, DE (Janisch.) Dmitrij Erastovich Janischewsky (1875–1944)
- Janka, V (Janka) Victor von Janka (1837–1900)
- Janovec, JP John Paul Janovec (1970– )
- Janse, AJT Antonius Johannes Theodorus Janse (1877–1970)
- Jansen, BC (B.C.Jansen) Berend Cornelis Jansen (1921–1987)
- Jansen, P (Jansen) Pieter Jansen (1882–1955)
- Jansen, RK (R.K.Jansen) Robert K. Jansen (1954– )
- Jansen-Jacobs, MJ (Jans.-Jac.) Marion Josephine Jansen-Jacobs (1944– )
- Janson, OE Oliver Erichson Janson (1850–1926)
- Janssens, E Emile Janssens (1907–1981)
- Jansson, C-A (C.-A.Jansson) Carl-Axel Jansson (1925– )
- Janz, H Horst Janz
- Janzen, DH Daniel Hunt Janzen
- Janzen, P Peter Janzen
- Jaramillo, CA César A. Jaramillo
- Jardine, W William Jardine (1800–1874)
- Jariangprasert, S (Jariangpr.) Sureeporn Jariangprasert
- Jarkov, AA Alexandr A. Jarkov
- Jarmolenko, AV (Jarm.) Alexander Viktorovich Jarmolenko (1905–1944)
- Jarms, G Gerhard Jarms
- Jarocki, FP Feliks Paweł Jarocki (1790–1865)
- Jaros, J (Jaros) Josef Jaros
- Jarrige, J Jean Jarrige (1904–1975)
- Jarrín–V., P Pablo Jarrín-Valladares
- Jarvik, AEV Anders Erik Vilhelm Jarvik (1907–1998)
- Jarvis, CE (C.E.Jarvis) Charles Edward Jarvis (1954–)
- Jarvis, WR (Jarvis) William Robert Jarvis (1927–)
- Jarzembowski, EA Edmund Aleksander Jarzembowski (1951–)
- Jaschhof, C Catrin Jaschhof
- Jaschhof, M Mathias Jaschhof
- Jastrzębski, P Piotr Jastrzębski (1967– )
- Játiva, CD (Játiva) Carlos D. Játiva
- Jatta, A (Jatta) Antonio Jatta (1852–1912)
- Jatzow, R R. Jatzow
- Jaubert, HF (Jaub.) Hippolyte François Jaubert (1798–1874)
- Jauffret, P Pierre Jauffret
- Jaume, D Damià Jaume (1963– )
- Jávorka, S (Jáv.) Sándor Jávorka (1883–1961)
- Jayalal, U (Jayalal) Udeni Jayalal
- Jayaweera, MA (Jayaw.) Don Martin Arthur Jayaweera (1912–1982)
- Jeanbernat, EJM (Jeanb.) Ernest Jules Marie Jeanbernat (1835–1888)
- Jeanes, JA (Jeanes) Jeffrey A. Jeanes
- Jeannel, RG René Gabriel Jeannel (1879–1965)
- Jeannin, P Pascale Jeannin
- Jebb, MHP Matthew H.P. Jebb
- Jedlička, L Ladislav Jedlička
- Jeekel, CAW (Jeekel) Casimir Albrecht Willem Jeekel
- Jeffrey, C (C.Jeffrey) Charles Jeffrey (1934– )
- Jeffrey, JF (Jeffrey) John Frederick Jeffrey (1866–1943)
- Jeffreys, JG John Gwyn Jeffreys (1809–1885)
- Jégu, M Michel Jégu
- Jehl, F François Jehl
- Jehl, JR Joseph R. Jehl
- Jeitteles, JH Ludwig Heinrich Jeitteles (1830–1883)
- Jekel, H Henri Jekel (1816–1891)
- Jekelius, E Erich Jekelius (1889–1970)
- Jelínek, J Josef Jelínek
- Jell, PA Peter Alexander Jell (1947– )
- Jellinek, T Thomas Jellinek
- Jelski, K Konstanty Jelski (1837–1896)
- Jendek, E Eduard Jendek
- Jeník, J Jan Jeník (1929– )
- Jenkins, AP Aaron P. Jenkins
- Jenkins, DW (Jenkins) Dale W. Jenkins
- Jenkins, JT James Travis Jenkins (1876–1959 )
- Jenkins, OP Oliver Peebles Jenkins (1850–1935)
- Jenkins, PD Paulina Deidre Jenkins (1945–)
- Jenkins, RE Robert E. Jenkins
- Jenner, JV Janann V. Jenner
- Jennings, HS (H.S. Jenn.) Herbert Spencer Jennings (1868–1947)
- Jennings, OE (Jenn.) Otto Emery Jennings (1877–1964)
- Jennings, PH Philip H. Jennings
- Jennison, HM Harry Milliken Jennison (1885–1940)
- Jenny, R Rudolph Jenny
- Jensen,CEO Christian E.O. Jensen (1859–1941)
- Jensen, FP Flemming Pagh Jensen
- Jensen, HL Hans Laurits Jensen
- Jensen, JA James Alvin Jensen (1918–1998)
- Jensen, JGK (Jensen) Johan Georg Keller Jensen (1818–1886)
- Jensen, KR Kathe R. Jensen
- Jensen, T (T.Jensen) Thomas Jensen (1824–1877)
- Jentink, FA Fredericus Anne Jentink (1884–1913)
- Jentys-Szaferowa, J (Jent.-Szaf.) Janina Jentys-Szaferowa (1895–1983)
- Jenyns, L Leonard Jenyns (1800–1893)
- Jeong, MH (M.H.Jeong) Min-Hye Jeong
- Jepps, MW (Jepps) Margaret Wolfe Jepps (1892—1977)
- Jepson, JE James E. Jepson
- Jepson, WL (Jeps.) Willis Linn Jepson (1867–1946)
- Jerdon, TC Thomas Caverhill Jerdon (1811–1872)
- Jerez Rodríguez, RV Rosa Viviane Jerez Rodríguez
- Jermy, AC (Jermy) Anthony Clive Jermy (1932–2014)
- Jérôme, C (Jérôme) Claude Jérôme (1937–2008)
- Jerzer, (Jerzer) Jerzer (fl. 1987)
- Jesiolowski, CA Craig A. Jesiolowski
- Jesionowska, K (Jesionowska) Katarzyna Jesionowska
- Jessen, KFW (Jess.) Karl Friedrich Wilhelm Jessen (1821–1889)
- Jessop, JP (Jessop) John Peter Jessop (1939– )
- Jesu, R Riccardo Jesu
- Jeswiet, J (Jeswiet) Jacob Jeswiet (1879–1966)
- Jewell, T Tony Jewell
- Jézéquel, J-F Jean-François Jézéquel
- Ji, Q Qiang Ji
- Ji, S Shuan Ji
- Ji, XX Xinxin Ji
- Jia, CX Chenxi Jia
- Jia, Z-F (Z.F.Jia) Ze-Feng Jia
- Jiang, A Aiwu Jiang
- Jiang, C Chenglin Jiang
- Jiang, H (H.Jiang) Hong Jiang (fl. 2003)
- Jiang, J (J.Jiang) Jigang Jiang
- Jiang, JP Jian-Ping Jiang
- Jiang, N (N. Jiang) Nan Jiang
- Jiang, NG (N.G.Jiang) Ning Gong Jiang (1936– )
- Jiang, SQ Sheng-Qiao Jiang
- Jiang, YM (Y.M.Jiang) Yu-Mei Jiang (1940– )
- Jiang, YM Yao-ming Jiang
- Jiang, ZG Zhong-Guan Jiang
- Jianu, CM Coralia-Maria Jianu
- Jim, J Jorge Jim
- Jiménez, M (Jiménez) Mauricio Jiménez
- Jiménez, ML María Luisa Jiménez
- Jiménez Albarran, MJ (Jiménez Alb.) Maria Josefa Jiménez Albarran
- Jiménez Almonte, J José de Jesús Jiménez Almonte
- Jiménez de la Espada, M Marcos Jiménez de la Espada (1831–1898)
- Jiménez Machorro, R (R.Jiménez) Rolando Jiménez Machorro (1961– )
- Jiménez Nah, CF (C.F.Jiménez) Carlos F. Jiménez Nah (fl. 2012)
- Jiménez Rodríguez, F (Jiménez Rodr.) Francisco Jiménez Rodríguez (1965– )
- Jin, F Fan Jin
- Jin, Q (Q. Jin) Qing Jin
- Jin, T (T. Jin) Tao Jin
- Jin, XH (X.H.Jin) Xiao-Hua Jin
- Jin, XS Xingsheng Jin
- Jin, YG Yu-gan Jin
- Jin, YX (Y.X.Jin) Yue Xing Jin (1934– )
- Jinbo, U (Jinbo) Utsugi Jinbo
- Jindra, Z Zdeněk Jindra
- Jing, XL Xi-Li Jing
- Joannis, J Joseph de Joannis (1864–1932)
- Joannis, L Leon de Joannis
- Joannou, JG (Joannou) John G. Joannou
- Jobson, PC (Jobson) Peter C. Jobson (1965– )
- Jockusch, EL Elizabeth Lacy Jockusch
- Jocqué, M Merlijn Jocqué
- Jocqué, R Rudy Jocqué
- Joger, U Ulrich Joger
- Johan-Olsen, O (Johan-Olsen) Olav Johan-Olsen (1860–1931)
- Johannsen, OA Oskar Augustus Johannsen (1870–1961)
- Johansen, DA (D.A.Johans.) Donald Alexander Johansen (1901– )
- Johansen, I Inger Johansen
- Johanson, KA Kjell Arne Johanson
- Johansson, D (D.Johanss.) Dick Johansson
- Johansson, R (R. Johansson) Roland Johansson
- Joharchi, M (Joharchi) Mohamadreza Joharchi (fl. 2005)
- Johki, Y Yutaka Johki
- John, AJI Ashish Joshia Ingty John
- John, V (V.John) Volker John
- Johnels, AG Alf G. Johnels (1917–2010)
- Johns, PM Peter Malcolm Johns
- Johnson, AA Arthur Albin Johnson (1925–2020)
- Johnson, AB Andrew B. Johnson
- Johnson, AM (A.M.Johnson) Arthur Monrad Johnson (1878–1943)
- Johnson, AW Alfredo William Johnson
- Johnson, C Colin Johnson (1943–2021)
- Johnson, CD Clarence Dan Johnson (1931–2005)
- Johnson, DM (D.M.Johnson) David Mark Johnson (1955– )
- Johnson, ERL (E.R.L.Johnson) Eileen Ruth Laithlain Johnson (1896–1972)
- Johnson, F (F. Johnson) Frank Johnson
- Johnson, G Gabriel Johnson (fl. 2014)
- Johnson, GD G. David Johnson
- Johnson, GP (Gabr.P.Johnson) Gabriel P. Johnson (fl. 2014)
- Johnson, JG John Granville Johnson (1932–1994)
- Johnson, JL John L. Johnson (1937–1996)
- Johnson, JW (Jo.W. Johnson) John W. Johnson
- Johnson, JW Jeffrey W. Johnson
- Johnson, JY James Yate Johnson (1820–1900)
- Johnson, K (K.Johnson) Kurt Johnson
- Johnson, KP (K.P.Johnson) Kevin P. Johnson
- Johnson, KR Kirk Richard Johnson
- Johnson, LA (L.A.Johnson) Leigh Alma Johnson (1966– )
- Johnson, LAS (L.A.S.Johnson) Lawrence Alexander Sidney Johnson (1925–1997)
- Johnson, LP (Laur.P.Johnson) Laurence P. Johnson
- Johnson, M (M.Johnson) Magnus Johnson
- Johnson, NF Norman F. Johnson
- Johnson, NK Ned K. Johnson (1932–2003)
- Johnson, O Oscar Johnson
- Johnson, PJ Paul J. Johnson
- Johnson, PN (P.N. Johnson) Peter Neville Johnson
- Johnson, RF Rebecca Fay Johnson
- Johnson, RW (R.W.Johnson) Robert William Johnson (1930– )
- Johnson, S Scott Johnson
- Johnson, W (W.Johnson) William Johnson (1844–1919)
- Johnston, BC Barry C. Johnston
- Johnston, G (Johnst.) George Johnston (1797–1855)
- Johnston, HB Henry Bennett Johnston (1886–1974)
- Johnston, IM (I.M.Johnst.) Ivan Murray Johnston (1898–1960)
- Johnston, J (J.Johnst.) Jen Johnston (1954– )
- Johnston, JR (J.R.Johnst.) John Robert Johnston (1880–1953)
- Johnston, MC (M.C.Johnst.) Marshall Conring Johnston (1930– )
- Johnston, PR Peter R. Johnston
- Johnston, RM (R.M.Johnst.) Robert Mackenzie Johnston (1843–1918)
- Johnston, TH Thomas Harvey Johnston (1881–1951)
- Johnstone, RE Ronald Eric Johnstone
- Johow, FRA (Johow) Friedrich Richard Adelbart Johow (1859–1933)
- Joicey, JJ James John Joicey (1871–1932)
- Jokerst, JD (Jokerst) James D. Jokerst
- Jolivet, PHA (Jolivet) Pierre Hippolyte Auguste Jolivet (1922–2020)
- Joly, AB (A.B.Joly) Aylthon Brandão Joly (1924–1975)
- Joly, LJ Luis José Joly
- Jonasson, JÅ (Jonasson) Jan Å. Jonasson
- Jones, AG (A.G.Jones) Almut Gutter Jones (1923– )
- Jones, C Clyde Jones (1935– )
- Jones, CJ Clyde J. Jones
- Jones, CR Clive Ralph Jones
- Jones, D Dorothy Jones
- Jones, DA David Alan Jones
- Jones, DL David Lloyd Jones (1944– )
- Jones, DS Douglas S. Jones
- Jones, EBG (E.B.G. Jones) Evan Benjamin Gareth Jones (1937– )
- Jones, FM (F.M. Jones) Frank Morton Jones (1869–1962)
- Jones, FW Frederic Wood Jones (1879–1954)
- Jones, GN (G.N.Jones) George Neville Jones (1903–1970)
- Jones, GZ (G.Z. Jones) Guinevere Zandt Jones
- Jones, HG (H.G.Jones) Henry Gordon Jones (1939–1987)
- Jones, JK J. Knox Jones, Jr. (1929–1992)
- Jones, JPG Julia P.G. Jones
- Jones, KL Kirkland L. Jones
- Jones, ME Marcus E. Jones
- Jones, ML Meredith L. Jones
- Jones, NS Norman Sumner Jones
- Jones, PJ Peter John Jones
- Jones, RH (R.H.Jones) Rodney H. Jones (1951– )
- Jones, T Trevor Jones
- Jones, TA (T.A. Jones) T.A. Jones
- Jones, TR Thomas Rupert Jones (1819–1911)
- Jones, W (Jones) William Jones (1746–1794)
- Jones, WJ W. Joe Jones
- Jong, PC de (P.C.deJong) Petrus Cornelis de Jong (fl. 1976)
- Jong, R de (R.de Jong) Rienk de Jong
- Jongkind, CCH (Jongkind) Carel Christiaan Hugo Jongkind (1954– )
- Jonker, AME (A.M.E.Jonker) Anni Margriet Emma Jonker (1920– )
- Jonker, FP (Jonker) Fredrik Pieter Jonker (1912–1995)
- Jonsell, BE (Jonsell) Bengt Edvard Jonsell (1936– )
- Jonsson, L (L.Jonss.) Lars Jonsson (1946– )
- Jönsson, KL K. Ingemar Jönsson
- Jónsson, S (S.Jónss.) Sigurdur Jónsson
- Jope, M (Jope) Melvyn Jope
- Jordan, CTA (Jord.) Claude Thomas Alexis Jordan (1814–1897)
- Jordan, DS David Starr Jordan (1851–1931)
- Jordan, EA Emilio Ariel Jordan
- Jordan, EK Eric Knight Jordan (1903–1926)
- Jordan, EO Edwin Oakes Jordan ( –1936)
- Jordan, H Hanspeter Jordan
- Jordan, HV Harold V. Jordan
- Jordán, JC Juan Carlos Jordán
- Jordan, K Heinrich Ernst Karl Jordan (1861–1959)
- Jordan, RCR Robert Coane Roberts Jordan (1825–1890)
- Jordan, WP (W.P. Jord.) William Paul Jordan
- Jordana, R (R. Jordana) Rafael Jordana
- Jordon-Thaden, I (Jordon-Thaden) I. Jordon-Thaden (fl. 2012)
- Jörgens, D Dirk Jörgens
- Jørgensen, P (P.Jørg.) Peter Møller Jørgensen (1958– )
- Jörgensen, P Peter Jörgensen
- Jørgensen, PM (P.M.Jørg.) Per Magnus Jørgensen (1944– )
- Jörgensen, S (S.Jörg.) Sigurd Jörgensen (fl. 1973)
- Joseph, S (S. Joseph) Siljo Joseph
- Joseph-Ouni, M Mehdi Joseph-Ouni
- Joshi, M (M. Joshi) Mamta Joshi
- Joshi, R (R. Joshi) Rahul Joshi
- Joshi, S (S. Joshi) Santosh Joshi
- Joshi, Y (Y.Joshi) Yogesh Joshi
- Joshy, SH S. Hareesh Joshy
- Josifov, M Michail Josifov
- Josserand, M (Joss.) Marcel Josserand (1900–1992)
- Josso, J-F Jean-François Josso
- Jost, GF Glauco Fernando Jost
- Jouanin, C Christian Jouanin (1925– )
- Joubin, L Louis Joubin (1861–1935)
- Jourdan, C Claude Jourdan (1803–1873)
- Jousé, AP Anastasia P. Jousé (1905– )
- Jousseaume, FP Félix Pierre Jousseaume (1835–1921)
- Jovet-Ast, S (Jovet-Ast) Suzanne Jovet-Ast (1914–2006)
- Joy, JA James A. Joy
- Joyeux, JC Jean-Christophe Joyeux
- Juan, A (Juan) Ana Juan (1971– )
- Jubb, RA Rex A. Jubb
- Judd, DD Darlene D. Judd
- Judd, WS (Judd) Walter Stephen Judd (1951– )
- Judson, MLI Mark L.I. Judson
- Judziewicz, EJ (Judz.) Emmet J. Judziewicz (1953– )
- Juel, HO (Juel) Hans Oscar Juel (1863–1931)
- Jülich, W (Jülich) Walter Jülich (1942– )
- Juillet, J Jules Juillet
- Jumalon, J Julian Jumalon
- Jumelle, HL (Jum.) Henri Lucien Jumelle (1866–1935)
- Juncá, FA Flora Acuña Juncá
- Jundziłł, J (J.Jundz.) Józef Jundziłł (1794–1877)
- Jundziłł, SB (S.B.Jundz.) Stanisław Bonifacy Jundziłł (1761–1847)
- Jung, J (J.Jung) Jongduk Jung (fl. 2008)
- Jung, SY Seo-Youn Jung
- Jungbluth, P (Jungbluth) Patrícia Jungbluth
- Junge, GCA George Christoffel Alexander Junge (1905–1962)
- Jungfer, K-H Karl-Heinz Jungfer
- Junghuhn, FW (Jungh.) Franz Wilhelm Junghuhn (1809–1864)
- Junk, W Wilhelm Junk (1866–1942)
- Junnila, A (Junnila) Amy Junnila
- Junnilainen, J (Junnilainen) Jari Junnilainen
- Juraske, N Norbert Juraske
- Juratzka, J (Jur.) Jacob Juratzka (1821–1878)
- Jurcsak, T Tiberiu Jurcsak
- Jurine, L Louis Jurine (1751–1819)
- Jurtzev, BA (Jurtzev) Boris Alexandrovich Jurtzev (1932—2004)
- Jury, SL (Jury) Stephen Leonard Jury (1949– )
- Juslén, A (Juslén) Aino Juslén (1975– )
- Jussieu, A de (Ant.Juss.) Antoine de Jussieu (1686–1758)
- Jussieu, AHL de (A.Juss.) Adrien Henri Laurent de Jussieu (1797–1853)
- Jussieu, AL de (Juss.) Antoine Laurent de Jussieu (1748–1836)
- Jussieu, B de (B.Juss.) Bernard de Jussieu (1699–1777)
- Jussieu, C de (C.Juss.) Christophe de Jussieu (1685–1758)
- Jussieu, J de (J.Juss.) Joseph de Jussieu (1704–1779)
- Just, J Jean Just (1938– )
- Juste, J Javier Juste
- Justine, JL Jean-Lou Justine
- Justo, A (Justo) Alfredo Justo (fl. 2003)
- Jux, U Ulrich Jux
- Juzepczuk, SV (Juz.) Sergei Vasilievich Juzepczuk (1893–1959)
