Mary Lightfoot Tarleton Knollenberg (June 9, 1904 – December 21, 1992) was an American sculptor.
Born in Great Neck, Long Island, Knollenberg was a student of Mahonri Young and Heinz Warneke,[1] and received a Guggenheim Fellowship in 1933.[2] She later married historian Bernard Knollenberg, and was stepmother to his son Walter.[1] During her career she was a member of the National Association of Women Painters and Sculptors, the Sculptors Guild, and the American Art Congress.[3] Later in life Knollenberg counted among her friends Walker Evans.[4] She died in her sleep at her home in Chester, Connecticut.[1] Her work was the subject of a 2014 retrospective at the Florence Griswold Museum.[5] Her papers and journals, along with diaries of her artist-writer mother, Mary Livingston Tarleton née Plympton, are in the Sallie Bingham Center for Women's History and Culture at Duke University.