LessWrong (also written Less Wrong) is a community blog and forum focused on discussion of cognitive biases, philosophy, psychology, economics, rationality, and artificial intelligence, among other topics.

[1][2] LessWrong describes itself as an online forum and community aimed at improving human reasoning, rationality, and decision-making, with the goal of helping its users hold more accurate beliefs and achieve their personal objectives.

[3] The best known posts of LessWrong are "The Sequences", a series of essays which aim to describe how to avoid the typical failure modes of human reasoning with the goal of improving decision-making and the evaluation of evidence.

[7] LessWrong developed from Overcoming Bias, an earlier group blog focused on human rationality, which began in November 2006, with artificial intelligence researcher Eliezer Yudkowsky and economist Robin Hanson as the principal contributors.

[23] Scott Alexander became one of the site's most popular writers before starting his own blog, Slate Star Codex, contributing discussions on AI safety and rationality.