多纳蒂彗星(C/1858 L1)是一颗非常有名的长周期彗星，为意大利天文学家多纳蒂于1858年6月所发现，它的周期大约为1953年。多纳蒂彗星最接近地球是在1858年10月10日。

There are three Donati comets: C/1855 L1 (a.k.a. 1855 II), C/1858 L1 (this one), and C/1864 R1 (a.k.a. 1864 I).

Comet Donati, or Donati's Comet, formally designated C/1858 L1 and 1858 VI, is a long-period comet named after the Italian astronomer Giovanni Battista Donati who first observed it on June 2, 1858. After the Great Comet of 1811, it was the most brilliant comet that appeared in the 19th century. It was also the first comet to be photographed. It was nearest the Earth on October 10, 1858. The comet has an orbital inclination of 116.9°.