"Mr. Know It All" is a song recorded by American pop recording artist Kelly Clarkson. It was written by Brian Kennedy, Ester Dean, Brett James, and Dante Jones, with the production handled by Kennedy, Dean, and Jones. Clarkson described the song as a "vocally raw record" and stated that she and her producers strove to record her voice as it is heard at live performances, using as little auto-tune processing as possible. It was released by RCA Records as the lead single from her fifth studio album, Stronger on September 5, 2011.

Brian Kennedy Seals is an American songwriter, producer, composer, and multi-instrumentalist, best known for co-writing and producing pop hit singles "Disturbia", "Forever", "Don't Wake Me Up", and "Mr. Know It All", as well as hit R&B singles "If This Isn't Love", "What It Is ", and "No Time for It".