The phrase “world’s longest essay” is tricky because it depends on how you define essay . If you mean a single, continuous piece of argumentative or exploratory prose by one author (not a novel, not a compiled reference work), the title arguably belongs to (1859) by Charles Darwin—but even that runs about 150,000 words, far shorter than many doctoral dissertations.
For a single, continuous, non-fiction prose argument by one author, the record may go to by Richard Rhodes (c. 350,000 words) or The Gulag Archipelago by Aleksandr Solzhenitsyn (c. 500,000 words across three volumes). However, Solzhenitsyn called it a “literary investigation,” not an essay. worlds longest essay
If you want the : a French philosopher, Bernard-Henri Lévy , once wrote a 1,200-page essay on philosophy and war ( L’Esprit du judaïsme ), but again, publishers call it a book. The phrase “world’s longest essay” is tricky because
If you expand the definition to include , the record changes. The longest published “essay” in the traditional sense is often cited as The Story of Civilization by Will and Ariel Durant (11 volumes, ~2 million words). But that’s really a book series. 350,000 words) or The Gulag Archipelago by Aleksandr
: There is no universally accepted “longest essay” because once an essay exceeds ~50,000 words, publishers rebrand it as a book. The longest famous essay likely remains John Locke’s An Essay Concerning Human Understanding (1689) — 360,000 words, spanning four books. Locke called it one essay, and by that definition, he probably holds the crown.
So if you need a one‑sentence takeaway: John Locke’s 1689 philosophical work, at ~360,000 words, is the longest single work still universally titled an “essay” by its author and literary history.