"Mr. Know It All" is a song 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.

"Mr. Know It All" is a midtempo pop rock song with R&B influences, with its lyrical content dealing with the themes of heartbreak, and relationships with wisenheimers. Upon its release, "Mr. Know It All" has received mostly favorable reception from music critics, who noted the song as significantly different from Clarkson's previous releases. However, some critics compared this song to Alicia Keys' single "Doesn't Mean Anything" (2009) and Bruno Mars' single "Just the Way You Are" (2010). The song became a commercial success, it became her ninth top-ten hit on the Billboard Hot 100, and topped the Billboard Adult Pop Songs chart. Internationally, the song topped the charts in Australia and in South Korea, and has attained a top-ten position in New Zealand, Poland, the United Kingdom. It also became a crossover hit to the Billboard Hot Country Songs chart, becoming her first solo single to enter the country chart after 9 years since "A Moment Like This" (2002), prompting RCA to release a country version produced by Dann Huff in 2012.

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