: 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.
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
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. : There is no universally accepted “longest essay”
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. For a single, continuous, non-fiction prose argument by
: The longest essay ever attempted as a single sitting writing stunt is another matter. In 2021, a performance artist in Berlin typed for 120 hours straight, producing a 540,000-word stream-of-consciousness “essay” on loneliness. It was never published or verified.