Allen Hiram Curtiss (c. 1845–1907) was an American botanist.

[1] His work included the discovery of fern species at the Pineola Grotto.

[3] He collected many specimens, was an author of botanical books and an editor of four exsiccata-like series.

[4] The Florida Agricultural Experiment Station (established in 1888 as a division of the Florida College of Agriculture at Lake City), employed Curtiss for a brief tenure and several collections at the University of Florida Herbarium are named for him.

[7] His mother, Floretta Allen Curtiss was a keen phycologist, whose biographical sketch Allen H. Curtiss published in 1899.