Harpo

Harpo may refer to:


 * Harpo Marx, American comedian, mime artist, and musician best known as a member of the Marx Brothers
 * Harpo Productions, American multimedia company founded by Oprah Winfrey ("Harpo" is "Oprah" spelled backwards)
 * Harpo (singer), stage name of Jan Svensson, Swedish pop singer
 * Slim Harpo, stage name of James Moore, American blues musician
 * harpo- was a 1993 facetious proposal for an SI unit prefix standing for 10&minus;27