William Ashbrook Kellerman (May 1, 1850 Ashville, Ohio – March 8, 1908) was an American botanist, mycologist and photographer.

After graduation, Kellerman was hired as Professor of Natural Sciences at the Wisconsin State Normal School, a position he held for five years.

[7] He studied the smuts (fungal diseases) of wheat and oats, and demonstrated that hot water is an effective fungicide.

With Benjamin Matlack Everhart and Job Bicknell Ellis,[8] in 1885 he founded the Journal of Mycology, now Mycologia.

[9] It was there in 1908 that he contracted a fever (generally believed to be malaria), died, and was buried in the "cactus fenced cemetery at Zacapa.