DeLill S. Nasser (1929–2000) was an American geneticist who was referred to by R. Scott Hawley as the "patron saint of real genetics".

Her promotion of genetics research was highly influential in the creation of the Arabidopsis thaliana genome project and its use as a model organism.

Given multiple awards for her director work, she had an official scholarship named after her by the Genetics Society of America.

[7] Therefore, beginning in 1978,[8] she was made associate program director for the Division of Molecular and Cellular Biosciences in the NSF.

[9] In 1980, she was a staunch supporter and funder through her NSF position of the researchers who would begin the genetics work on Arabidopsis thaliana that would lead to it becoming a model organism in the field.