Sonnleithner is a surname. Notable people with the surname include:

• A family of lawyers from Vienna which is closely connected to the world of theater and music. Three of its members are of particular interest to biographers.
  • Christoph Sonnleithner (1734–1786), Austrian jurist and composer.
  • Joseph Sonnleithner (1766–1835), Austrian librettist, theater director, lawyer and archivist.
  • Ignaz von Sonnleithner (1770–1831), Austrian jurist, writer and educator.
  • Leopold von Sonnleithner (1797–1873), Austrian lawyer and composer.
  • Franz von Sonnleithner (1905–1981), Austrian lawyer and diplomat.

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