Patrizio Gennari (24 November 1820, Moresco – 1 February 1897, Cagliari) was an Italian botanist and patriot.
He served in the Second Italian War of Independence (the Austro-Sardinian War).
From 1866 to 1892, he was a professor at the University of Cagliari, Sardinia, and director of the university's botanic garden, the Orto Botanico dell'Università di Cagliari.