| Author (number of quotes) | Description |
| Ab |
| Abbey, Edward (3) | American author |
| Abdul-Jabbar, Kareem (1) | American professional basketball player |
| Abelard, Pierre (1) | French philosopher, theologian, logician |
| Ac |
| Achebe, Chinua (1) | Nigerian novelist, poet |
| Ackles, Jensen (1) | American actor |
| Ad |
| Adamov, Arthur (1) | Russian-born playwright |
| Adams, Ansel (1) | American photographer |
| Adams, Clark (1) | American freethought leader and activist |
| Adams, Douglas (26) | English author |
| Adams, Franklin Pierce (2) | American columnist |
| Adams, Henry Brooks (7) | American author, journalist, historian |
| Adams, Joey (1) | stage name of Joseph Abramowitz, American comedian |
| Adams, John (2) | second President of the United States |
| Adams, John Quincy (1) | American politician |
| Adams, Scott (15) | American comic strip writer |
| Addison, Joseph (6) | English author |
| Adenauer, Konrad (2) | German politician |
| Adler, Alfred (2) | Austrian psychotherapist |
| Adorno, Theodor W. (2) | German-born sociologist and philosopher |
| Ady, Endre (2) | Hungarian poet and publicist |
| Ae |
| Aesop (3) | Ancient Greek fabulist |
| Ag |
| Agar, Herbert (1) | American journalist |
| Agor, Weston H. (1) | |
| Ah |
| Ahern, Cecelia (1) | Irish-born author |
| Al |
| al-Sharif, Manal (1) | Saudi Arabian women's rights activist and computer scientist |
| Alba, Jessica (2) | American actress |
| Alberti, Leon Battista (1) | Italian architect, linguist, author and philosopher |
| Albom, Mitch (16) | American author, journalist and screenwriter |
| Albright, Herm (1) | German-born American painter |
| Alcott, Louisa May (6) | American author |
| Aldrich, Thomas Bailey (1) | American author and poet |
| Aldrin, Buzz (4) | American astronaut |
| Alexander, Shana (1) | American journalist |
| Ali, Muhammad (11) | American boxer |
| Allan, Gary (1) | stage name of Gary Allan Herzberg, American singer and dalszerző |
| Allen, Fred (2) | American comedian |
| Allen, James (2) | New Zealand politician and diplomat |
| Allen, Woody (27) | American author, actor, director and producer |
| Allende, Isabel (2) | Chilean American writer |
| Allport, Gordon W. (1) | American psychologist |
| Alsop, Stewart (1) | American newspaper columnist |
| Altshuler, Michael (1) | American motivational speaker |
| Am |
| Amati, Daniele (1) | Italian physicist |
| Amiel, Henri-Frédéric (8) | Swiss philosopher, poet and criticist |
| Amis, Martin (1) | British novelist |
| An |
| Anaxagoras (1) | Ancient Greek philosopher |
| Andersen, Hans Christian (1) | Danish author |
| Anderson, C. J. (2) | American author |
| Anderson, David J. (1) | American neurobiologist |
| Anderson, Harry (1) | American actor and magician |
| Anderson, Philip W. (1) | American physicist |
| Anderson, Walter (1) | American author, painter |
| Angelou, Maya (13) | American author and poet |
| Annan, Kofi (1) | Ghanaian diplomat |
| Anthony, Piers (1) | English-American author |
| Ap |
| Apollinaire, Guillaume (1) | French author, poet, criticist |
| Ar |
| Arany, János (3) | Hungarian poet |
| Archimedes (1) | Greek mathematician, physicist, engineer |
| Arden, Paul (21) | American creative director and author |
| Argov, Sherry (2) | American author |
| Aristotle (8) | Ancient Greek philosopher and scientist |
| Armstrong, Billie Joe (1) | American musician |
| Armstrong, Kelley (1) | Canadian writer |
| Armstrong, Louis Daniel (2) | American singer |
| Armstrong, Neil Alden (1) | American astronaut, aerospace engineer |
| Arnold, Matthew (2) | English poet |
| Arnold, Vladimir (1) | Soviet-Russian mathematician |
| Aronson, Elliot (1) | American psychologist |
| As |
| Asch, Sholem (1) | Polish-born American novelist |
| Ashton, Kevin (2) | British technology pioneer |
| Asimov, Isaac (37) | Russian-born American author and biochemist |
| At |
| Atkinson, Brooks (1) | American theatre critic |
| Atkinson, Rowan (1) | English comedian |
| Atwater-Rhodes, Amelia (1) | American author |
| Atwood, Margaret (8) | Canadian poet and novelist |
| Au |
| Auden, Wystan Hugh (1) | English author |
| Auerbach, Berthold (1) | German-Jewish poet, author |
| Aughey, John H. (1) | |
| Aurelius, Marcus (5) | Roman Emperor |
| Austen, Jane (15) | English author |
| Auster, Paul (2) | American author |
| Auvil, Myrtle (1) | |
| Az |
| Azalea, Iggy (1) | stage name of Amethyst Amelia Kelly, Australian rapper, songwriter and model |
| Azevedo, Sasha (1) | American actress |