Skeptics in the Pub is an informal social event designed to promote fellowship and social networking among skeptics, critical-thinkers, and other like-minded individuals. It provides an opportunity for skeptics and rationalists to talk, share ideas in a casual atmosphere, and discuss whatever topical issues come to mind. It allows participants to have fun while promoting skepticism, science, and rationality.

The usual format of meetings includes an invited speaker who gives a talk on a specific topic, followed by a question-and-answer session. Other meet-ups are informal socials, with no fixed agenda. The groups usually meet once a month at a public venue, most often a local pub. There are now more than 100 different "SitP" groups running around the world.