- American Masters: Eugene O'Neill - Biography of the twentieth-century playwright.
- eOneill.com: An Electronic Eugene O'Neill Archive - An electronic forum for discussion of O'Neill's works, collected essays, and information on the private O'Neill collection of Harley Hammerman, MD.
- Eugene (Gladstone) O'Neill (1888-1953) - Biography of the Nobel-winning American playwright, with selected bibliography.
- Eugene O'Neill (1888-1953) - Biography of American playwright Eugene O'Neill, plus links to all of his works currently in print.
- Eugene O'Neill, Playwright - Biography, related internet resources, e-texts.
- Eugene O'Neill: From Cardiff to Xanadu - An article examining the life and works of America's first true dramatic genius, Eugene O'Neill.
- Literature, Arts, and Medicine Database: O'Neill, Eugene - Reviews of his dramas from a medical perspective.
- little blue light: Eugene O'Neill - Short biography, synopses of his works, bibliography of O'Neill criticism, message board.
- The Nobel Prize in Literature, 1936 - Award presentation speech, acceptance speech at the banquet, portrait, Eugene O'Neill's autobiography at the time and a biographical note on his later years.
- The Reader's Companion to American History: O'Neill, Eugene - Introduction to the writer, for university students, by Arthur and Barbara Gelb.