The Sokal affair, also known as the Sokal hoax, was a demonstrative scholarly hoax performed by Alan Sokal, a physics professor at New York University and University College London. In 1996, Sokal submitted an article to Social Text, an academic journal of cultural studies. The submission was an experiment to test the journal's intellectual rigor, specifically to investigate whether "a leading North American journal of cultural studies—whose editorial collective includes such luminaries as Fredric Jameson and Andrew Ross—[would] publish an article liberally salted with nonsense if (a) it sounded good and (b) it flattered the editors' ideological preconceptions."

The article, "Transgressing the Boundaries: Towards a Transformative Hermeneutics of Quantum Gravity", was published in the journal's Spring/Summer 1996 "Science Wars" issue. It proposed that quantum gravity is a social and linguistic construct. The journal did not practice academic peer review at the time, so it did not submit the article for outside expert review by a physicist. Three weeks after its publication in May 1996, Sokal revealed in the magazine Lingua Franca that the article was a hoax.

The hoax caused controversy about the scholarly merit of commentary on the physical sciences by those in the humanities; the influence of postmodern philosophy on social disciplines in general; and academic ethics, including whether Sokal was wrong to deceive the editors or readers of Social Text; and whether Social Text had abided by proper scientific ethics.

In 2008, Sokal published Beyond the Hoax, which revisited the history of the hoax and discussed its lasting implications.

In an interview on the U.S. radio program All Things Considered, Sokal said he was inspired to submit the bogus article after reading Higher Superstition (1994), in which authors Paul R. Gross and Norman Levitt claim that some humanities journals will publish anything as long as it has "the proper leftist thought" and quoted (or was written by) well-known leftist thinkers.

Gross and Levitt had been defenders of the philosophy of scientific realism, opposing postmodernist academics who questioned scientific objectivity. They asserted that anti-intellectual sentiment in liberal arts departments (especially English departments) caused the increase of deconstructionist thought, which eventually resulted in a deconstructionist critique of science. They saw the critique as a "repertoire of rationalizations" for avoiding the study of science.

Sokal reasoned that if the presumption of editorial laziness was correct, the nonsensical content of his article would be irrelevant to whether the editors would publish it. What would matter would be ideological obsequiousness, fawning references to deconstructionist writers, and sufficient quantities of the appropriate jargon. After the article was published and the hoax revealed, he wrote:

The results of my little experiment demonstrate, at the very least, that some fashionable sectors of the American academic Left have been getting intellectually lazy. The editors of Social Text liked my article because they liked its conclusion: that "the content and methodology of postmodern science provide powerful intellectual support for the progressive political project" [sec. 6]. They apparently felt no need to analyze the quality of the evidence, the cogency of the arguments, or even the relevance of the arguments to the purported conclusion.