Aalto, Alvar (Hugo Alvar Henrik) (1898–1976)

Abbe, Ernst (1840–1905)

Abel, Neils Henrik (1802–1829)

Abercrombie, (Leslie) Patrick (1879–1957)

Abetti, Giorgio (1882–1982)

Abrikosov, Alexei Alexeyevich (1928–2017)

Ackerman, James S(loss) (1919–2016)

Ackerman, Nathan W(ard) (1909–1971)

Adam (architects) (Adam)

Adams, John Couch (1819–1892)

Adams, Robert McC(ormick) (1926– )

Adams, Walter Sydney (1876–1956)

Addams, Jane (1860–1935)

Addison, Thomas (1793–1860)

Adleman, Leonard (1945– )

Adler, Alfred (1870–1937)

Adler, Dankmar (1844–1900)

Adrian, Edgar Douglas (1889–1977)

Agassiz, (Jean) Louis Rodolphe (1807–1873)

Agnesi, Maria Gaetana (1718–1799)

Agnon, Shmuel Yosef (1888–1970)

Agre, Peter (1949– )

Agre, Peter Courtland (1949– )

Agricola, Georgius (1490–1555)

Ahtisaari, Martti (Oiva Kalevi) (1937– )

Aiken, Howard Hathaway (1900–1973)

Airy, George Biddell (1801–1892)

Aitken, Robert Grant (1864–1951)

Akasaki, Isamu (1929– )

al-Sufi (903–986)

Alberti, Leon Battista (1404–1472)

Alder, Kurt (1902–1958)

Aleixandre, Vicente (1898–1984)

Aleksandrov, Pavel Sergeevich (1896–1982)

Alessi, Galeazzo (1512–1572)

Alexander, Hattie Elizabeth (1901–1968)

Alexievich, Svetlana (1948– )

Alferov, Zhores Ivanovich (1930– )

Alfvén, Hannes Olof Gösta (1908–1995)

Alhazen, Abu Alī al-Hassan ibn al-Haytham (c. 965–1038)

Allais, Maurice (1911–2010)

Allport, Gordon (Willard) (1897–1967)

Alpher, Ralph Asher (1921–2007)

Alter, David (1807–1881)

Altman, Sidney (1939– )

Alvarez, Luis Walter (1911–1988)

Alzheimer, Alois (1864–1915)

Amano, Hiroshi (1960– )

Ambartsumian, Viktor Amazasp Amazaspovich (1908–1996)

Ammanati, Bartolommeo (1511–1592)

Ampère, André-Marie (1775–1836)

Amsler-Laffon, Jakob (1823–1912)

Anastasi, Anne (1908–2001)

Anaximander the Elder (c. 611–547 BC)

Anderson, Carl David (1905–1991)

Anderson, John R.

Anderson, Philip Warren (1923– )

Ando, Tadao (1941– )

Andrews, Thomas (1813–1885)

Andrič, Ivo (1892–1974)

Andronicus II Palaeologus (1260–1332)

Anfinsen, Christian Boehmer (1916–1995)

Angell, (Ralph) Norman (1874–1967)

Angell, James (Rowland) (1869–1949)

Ångström, Anders Jonas (1814–1874)

Annan, Kofi (1938– )

Annear, Harold Desbrowe (1865–1933)

Anning, Mary (1799–1847)

Anokhin, Piotre Kuzmich (1897–1974)

Anthemius (lived 5th–6th century AD)

Antoniadi, Eugène Marie (1870–1944)

Apgar, Virginia (1909–1974)

Apollodorus (lived AD 97–130)

Apollonius of Perga (c. 245–c.190 BC)

Appert, Nicolas François (c.1750–1841)

Appleton, Edward Victor (1892–1965)

Arafat, Yassir (1929–2004)

Arago, (Dominique) François (Jean) (1786–1853)

Arber, Werner (1929– )

Archer, John Lee (1791–1852)

Archer, Thomas (1668–1743)

Archimedes (c. 287–212 BC)

Ardemáns, Teodoro (1664–1726)

Argand, Jean Robert (1768–1822)

Argelander, Friedrich Wilhelm August (1799–1875)

Argyris, Chris(topher) (1923–2013)

Argyropoulos, John (Janos) (c. 1415–1487)

Arias Sanchez, Oscar (1940– )

Aristarchos (c. 320–c. 250 BC)

Aristotle (384–322 BC)

Arkwright, Richard (1732–1792)

Armelagos, George J(ohn) (1936–2014)

Armstrong, Edwin Howard (1890–1954)

Armstrong, William George (1810–1900)

Arnoldson, Klas P(ontus) (1844–1916)

Arnolfo di Cambio (c. 1245–c. 1302)

Arp, Halton Christian (1927–2013)

Arrhenius, Svante August (1859–1927)

Arrow, Kenneth Joseph (1921–2017)

Artin, Emil (1898–1962)

Arup, Ove (1895–1988)

Asplund, (Erik) Gunnar (1885–1940)

Asser, Tobias M(ichael) C(arel) (1838–1913)

Aston, Francis William (1877–1945)

Asturias, Miguel Ángel (1899–1974)

Atkinson, Robert D'escourt (1898–1982)

Attenborough, David Frederick (1926– )

Atwater, Brian F.

Audubon, John James Laforest (1785–1851)

Auer, Carl (Auer, Carl)

Aumann, Robert John (1930– )

Aung San Suu Kyi (1945– )

Avery, Oswald Theodore (1877–1955)

Avicenna (980–1037)

Avogadro, Amedeo (1776–1856)

Axel, Richard (1946– )

Axelrod, Julius (1912–2004)

Ayrton, Hertha (Phoebe Sarah) Marks (1854–1923)

Ayrton, William Edward (1847–1908)