Judy Dater is an American photographer and feminist. She is perhaps best known for her 1974 photograph, Imogen and Twinka at Yosemite, featuring an elderly Imogen Cunningham, one of America's first woman photographers, encountering a nymph in the woods of Yosemite. The nymph is the model Twinka Thiebaud. The photo was published in Life magazine in its 1976 issue about the first 200 years of American women. Her photographs, such as her Self-Portraiture sequence, were also exhibited in the Getty Museum.