Look up know-it-all in Wiktionary, the free dictionary.

A know-it-all is a person who appears to offers expert opinion, without possessing it.

Know-it-all or know-all may also refer to:

• The Know-It-All, a 2004 book by A.J. Jacobs
• "Doctor Know-all", a German fairy tale

• "Know All", an episode of Round the Twist, an Australian children's TV series
• Knowitalls, a 2009 British quiz show
• Mister Know-It-All, an American animated web series
• Mr. Know-It-All, a segment of the American Rocky and Bullwinkle TV cartoon

• Know-It-All, a 2015 album by Alessia Cara
• "Mr. Know It All", a 2011 single by Kelly Clarkson
• "He's Misstra Know-It-All", a 1974 Stevie Wonder song

• Canada's Greatest Know-It-All, a 2012 Canadian reality television series
• Like You Know It All, a 2009 South Korean comedy-drama
• Please Kill Mr. Know It All, a 2013 Canadian romantic comedy film

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