Authors Born on January 1
- Aaidh ibn Abdullah al-Qarni Scholar, 1960
- Abhay Kumar Poet, 1980
- Abraham Cowley Poet, 1618
- Aby Rosen Art Collector, 1960
- Adrian Ballinger Mountaineer, 1976
- Adrian Levy Journalist, 1965
- Afia Nathaniel Film Maker, 1974
- Agnes Gund Philanthropist, 1938
- Ahmad Shukeiri Politician, 1908
- Akbar Al Baker Chief Executive Officer, 1962
- Alan Mak Writer, 1965
- Alec Berg Writer, 2000
- Alec-Tweedie Author, 1862
- Alex Biryukov Cryptographer, 1953
- Alex D. Linz Actor, 1989
- Alex Gansa Screenwriter, 2000
- Alexander Stille Journalist, 1957
- Alexia Trif Singer-Songwriter, 1999
- Alfred Stieglitz Photographer, 1864
- Ali Partovi Entrepreneur, 2000
- Alissa Nutting Writer, 2000
- Ally Carter Author, 1974
- Alvin R. Dyer Apostol, 1903
- Andrew Hollander Singer, 1950
- Andrew Mayne Magician, 2000
- Andy Gill Musician, 1956
- Angourie Rice Actress, 2001
- Anjan Sundaram Journalist, 1950
- Anna Banks Author, 2000
- Anna Biller Film Maker, 1965
- Anthony Hemingway Film Director, 1977
- Anthony McGowan Novelist, 1965
- Anthony Wayne Soldier, 1745
- Aretaeus of Cappadocia Physician, 100
- Arjun Makhijani Engineer, 1945
- Arlene Hunt Novelist, 1972
- Arnold Mindell Psychotherapist, 1940
- Arthur Bloch Writer, 1948
- Arthur Danto Art Critic, 1924
- Arthur Hugh Clough Poet, 1819