- Atalay, Erdogan (b. 1966), German-born Turkish-descended actor
- Atanasoff, John Vincent (1903-1995)
- Atanes, Carlos (born 1971), Spanish film director
- Atatürk, Mustafa Kemal (1881-1938), Turkish leader
- Atchison, David Rice (1807-1886), Politikour amerikan
- Atef, Mohammed, activist
- Atget, Eugène (1857‑1927), French photographer
- Athanasios of Alexandria (1250-1261), Coptic Pope
- Athanasios II of Alexandria (489-496), Coptic Pope
- Athanasius, Patriarch (298-373), Coptic Pope, Patriarch of Alexandria
- Athanasius II of Alexandria, Patriarch of Alexandria
- Athanasius III of Alexandria, Patriarch of Alexandria
- Athanasius IV of Alexandria, Patriarch of Alexandria
- Athanasius IV, Patriarch, patriarch of Constantinople
- Athanasius V, Patriarch, patriarch of Constantinople
- Athanasius of Alexandria (298-373), Coptic Pope, Patriarch of Alexandria
- Athanasius the Athonite (c. 920-c. 1000), saint
- Athelgar, English religious leader
- Ætheling, Edgar (c. 1051-c. 1126), English monarch
- Athelm (died 923), English religious leader
- Athelstan of England (c. 895-939), English monarch
- Athenagoras, Patriarch (1886-1972), patriarch of Constantinople
- Athenagoras of Athens (c. 133-190), relligious leader & author
- Athendodorus, patriarch of Constantinople
- Athendodorus, Patriarch, patriarch of Constantinople
- Atherton, Gertrude (1857–1948), American writer
- Atiyah, Michael Francis (born 1929), British mathematician
- Atkins, Chet (1924-2001), composer & musician
- Atkins, Norman K. (born 1934), Canadian politician
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- Atkinson, Arthur K. (fl. mid-20th century), American railroad business manager
- Atkinson, Bill (fl. 1980s), American software engineer
- Atkinson, Rowan (born 1955), British comedian
- Atkov, Oleg (born 1949), Russian astronaut
- Atlan, Jean-Michel (1913-1960), French painter
- Atlas, Natacha (born 1964), Belgian-born cosmopolitan singer
- Atlee, Samuel (1739-1786), American politician
- Atsumi, Kiyoshi (1929-1996), Japanese actor
- Atta, Mohammed (1968-2001), Egyptian activist
- Attar (ca. 1142- ca. 1220), Persian poet
- Attar-Kittakh (ca. 1310 - ca. 1300 BC)
- Attell, Dave, comedian
- Attell, Abe (1885-1970), boxer
- Attenborough, David, Sir
- Attenborough, Richard, Lord (born 1923), British actor & director
- Attendolo, Muzio (1369-1424)
- Atterbom, Per Daniel Amadeus, Swedish writer
- Atterbury, William W. (1866-1935), American soldier & railroad business manager
- Atticus, patriarch of Constantinople
- Atticus, Cosmas, patriarch of Constantinople
- Atticus, Patriarch, patriarch of Constantinople
- Attila the Hun (406?-453), King of the Huns
- Attlee, Clement (1883-1967), British prime minister
- Attucks, Crispus (1723-1770), American activist
- Atwater-Rhodes, Amelia (born 1984), American writer
- Attwood, Thomas (1783-1859), British economist & politician
- Atwood, Margaret (born 1939), Canadian author
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