Twinka Thiebaud (December 9, 1945), is an American model who posed for many of the most important photographers of the 20th century.
A photograph depicting Thiebaud, "Imogen and Twinka at Yosemite" by Judy Dater, is considered among the most iconic photos in art history, and was the first adult full frontal nude photograph published in Life magazine.
Another photo of Thiebaud by Dater is included in The Woman's Eye (1973), a book devoted to women photographers, and also served as the cover image.