Leopold Joseph Franz Johann Fitzinger (13 April 1802 – 20 September 1884) was an Austrian zoologist.

He worked at the Vienna Naturhistorisches Museum between 1817, when he joined as a volunteer assistant, and 1821, when he left to become secretary to the provincial legislature of Lower Austria; after a hiatus, he was appointed assistant curator in 1844 and remained at the Naturhistorisches Museum until 1861.

In 1826, he published Neue Classification der Reptilien, based partly on the work of his friends Friedrich Wilhelm Hemprich and Heinrich Boie.

In 1843, he published Systema Reptilium, covering geckos, chameleons and iguanas.

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