Hannah Caroline Aase (July 12, 1883 – November 23, 1980)[1] was an American botanist and cytologist.

[5] In her 1915 dissertation, she studied the vascular anatomy of the megasporophylls of conifers.

[5] She became an instructor of botany at the State College of Washington in 1914 and taught morphology.

[8][9] She often co-authored papers on Allium aaseae, Aase's Onion, with Francis Marion Ownbey, a fellow faculty member at WSU.

Washington State University has honored her legacy with the Aase Fellowship in Botany which used in the recruitment of new graduate students.