Genevieve "Gennie" DeWeese (née Adams; January 10, 1921 – November 26, 2007) was a modernist painter and prominent member of the art community in Bozeman, Montana.

Gennie and her husband, Robert "Bob" DeWeese were notable for the major role they played in the development of the Montana contemporary arts community.

[3] DeWeese graduated from Ohio State University, where she studied with Hoyt Sherman, with a bachelor's degree in fine arts.

She also lived briefly in New York City and Battle Creek, Michigan, where she did occupational therapy at an army hospital during World War II.

[6] She and her husband were credited with “bringing modernism and non-objective expressionism” to Montana and other regions of the West.

DeWeese also expanded into creating giant scrolls rather than traditional canvases[8] as well as working in wood-cut printmaking, monoprints and lithographs.

In 1977, DeWeese and her husband made their Bozeman home into a gallery, where they exhibited work by local artists.

In 1985, she was featured as part of a Wall Street Journal article on the Western Arts Foundation.