Henri Guillaume Galeotti (10 September 1814 – 1858) was a French-Belgian botanist and geologist of Italian parentage born in Paris.
After graduation, he spent the next five years in Mexico performing geological and botanical research.
During this time period, he collaborated with botanist Martin Martens (1797-1863) on scientific study of species native to Mexico.
In 1853 he became director of the Jardin botanique de Bruxelles (Botanical Garden of Brussels), a position he maintained until his death in 1858 from tuberculosis.
After Galeotti's death in 1858, his personal Mexican herbarium was purchased from his widow by the Jardin botanique de Bruxelles.